Genre Science. Page - 7

uld be answered. To get the full benefit, Little Book must be studied, for it is the only authorized textbook of the "Watch Your Weights."

2

Key to the Calories

Some one page the thin? They come back here.

[Sidenote: Don't Skip This]

Definition to learn:

CALORIE; symbol C.; a heat unit and food value unit; is that amount of heat necessary to raise one pound of water 4 degrees Fahrenheit.

[Sidenote: Pronounced Kal'-o-ri]

There is a good deal of effort expended by many semi-educated individuals to discredit the knowledge of calories, saying that it is a foolish food science, a fallacy, a fetish, and so forth.

They reason, or rather say, that because there are no calories in some of the very vital elements of foods--the vitamines and the mineral salts--therefore it is not necessary to know about them. They further argue that their grandfathers never heard of calories and they got along all right. That grandfather argument

that many details of structure in man could not be explained through natural selection, I invented sexual selection; I gave, however, a tolerably clear sketch of this principle in the first edition of the 'Origin of Species,' and I there stated that it was applicable to man. This subject of sexual selection has been treated at full length in the present work, simply because an opportunity was here first afforded me. I have been struck with the likeness of many of the half-favourable criticisms on sexual selection, with those which appeared at first on natural selection; such as, that it would explain some few details, but certainly was not applicable to the extent to which I have employed it. My conviction of the power of sexual selection remains unshaken; but it is probable, or almost certain, that several of my conclusions will hereafter be found erroneous; this can hardly fail to be the case in the first treatment of a subject. When naturalists have become familiar with the idea of sexual selection, it wi

ical and chemical condition in which it moves.

It is comprehensible that a person could not have arrived at such afar-reaching change of view by continuing to follow the old beatenpaths, but only by introducing some sort of new idea. Indeed,Einstein arrived at his theory through a train of thought of greatoriginality. Let me try to restate it in concise terms.

THE EARTH AS A MOVING CAR

Everyone knows that a person may be sitting in any kind of a vehiclewithout noticing its progress, so long as the movement does not varyin direction or speed; in a car of a fast express train objects fallin just the same way as in a coach that is standing still. Only whenwe look at objects outside the train, or when the air can enter thecar, do we notice indications of the motion. We may compare the earthwith such a moving vehicle, which in its course around the sun hasa remarkable speed, of which the direction and velocity during aconsiderable period of time may be regarded as constant. In placeof the a

for I should soon have got over my disgust; and the practice would have been invaluable for all my future work. This has been an irremediable evil, as well as my incapacity to draw. I also attended regularly the clinical wards in the hospital. Some of the cases distressed me a good deal, and I still have vivid pictures before me of some of them; but I was not so foolish as to allow this to lessen my attendance. I cannot understand why this part of my medical course did not interest me in a greater degree; for during the summer before coming to Edinburgh I began attending some of the poor people, chiefly children and women in Shrewsbury: I wrote down as full an account as I could of the case with all the symptoms, and read them aloud to my father, who suggested further inquiries and advised me what medicines to give, which I made up myself. At one time I had at least a dozen patients, and I felt a keen interest in the work. My father, who was by far the best judge of character whom I ever knew, declared that I

t as though I had stumbled into the eighteenth century and were calling on Giambattista Vico. After a brief inspection by a young man with the appearance of a secretary, I was told that I was expected, and admitted into a small room opening out of the hall. Thence, after a few moments' waiting, I was led into a much larger room. The walls were lined all round with bookcases, barred and numbered, filled with volumes forming part of the philosopher's great library. I had not long to wait. A door opened behind me on my left, and a rather short, thick-set man advanced to greet me, and pronouncing my name at the same time with a slight foreign accent, asked me to be seated beside him. After the interchange of a few brief formulae of politeness in French, our conversation was carried on in Italian, and I had a better opportunity of studying my host's air and manner. His hands he held clasped before him, but frequently released them, to make those vivid gestures with which Neapolitans frequently clinch their phrase.

t instigated by love of knowledge]

In fact, the history of physical science teaches (and we cannot too carefully take the lesson to heart) that the practical advantages, attainable through its agency, never have been, and never will be, sufficiently attractive to men inspired by the inborn genius of the interpreter of nature, to give them courage to undergo the toils and make the sacrifices which that calling requires from its votaries. That which stirs their pulses is the love of knowledge and the joy of the discovery of the causes of things sung by the old poets--the supreme delight of extending the realm of law and order ever farther towards the unattainable goals of the infinitely great and the infinitely small, between which our little race of life is run. In the course of this work, the physical philosopher, sometimes intentionally, much more often unintentionally, lights upon something which proves to be of practical value. Great is the rejoicing of those who are benefited thereby; and, for the

ts had been seeking a panacea for all the ills to which flesh is heir, indeed for something which would enable men even to defy Death, and the subtle new spirit was eagerly proclaimed as the long-looked-for cure-all, if not the very aqua vitæ itself. Physicians introduced it to their patients, and were lavish in their praises of its curative powers. The following is quoted from the writings of Theoricus, a prominent German of the sixteenth century, as an example of medical opinion of alcohol in his day:--

"It sloweth age, it strengtheneth youth, it helpeth digestion, it cutteth phlegme, it cureth the hydropsia, it healeth the strangurie, it pounces the stone, it expelleth gravel, it keepeth the head from whirling, the teeth from chattering, and the throat from rattling; it keepeth the weasen from stiffling, the stomach from wambling, and the heart from swelling; it keepeth the hands from shivering, the sinews from shrinking, the veins from crumbling, the bones from aching, and the marrow

chanic. The editor of a newspaper was always a printer and often composed his articles as he set them in type; so "composing" came to mean typesetting, and one who sets type is a compositor. Now James needed an apprentice. It happened then that young Benjamin, at the age of thirteen, was bound over by law to serve his brother.

James Franklin printed the "New England Courant", the fourth newspaper to be established in the colonies. Benjamin soon began to write articles for this newspaper. Then when his brother was put in jail, because he had printed matter considered libelous, and forbidden to continue as the publisher, the newspaper appeared in Benjamin's name.

The young apprentice felt that his brother was unduly severe and, after serving for about two years, made up his mind to run away. Secretly he took passage on a sloop and in three days reached New York, there to find that the one printer in the town, William Bradford, could give him no work. Benjamin then set out for Philadelphia. By boat

oils deservemention. The "cold-drawn" Arachis oil (pea-nut or earth-nut oil) has apleasant flavour, resembling that of kidney beans. The "cold-drawn" Sesaméoil has an agreeable taste, and is considered equal to Olive oil foredible purposes. The best qualities are rather difficult to obtain; thoseusually sold being much inferior to Peach-kernel and Olive oils.Cotton-seed oil is the cheapest of the edible ones. Salad oil, not soldunder any descriptive name, is usually refined Cotton-seed oil, withperhaps a little Olive oil to impart a richer flavour.

The solid fats sold as butter and lard substitutes, consist of deodorisedcocoanut oil, and they are excellent for cooking purposes. It is claimedthat biscuits, &c., made from them may be kept for a much longer period,without showing any trace of rancidity, than if butter or lard had beenused. They are also to be had agreeably flavoured by admixture withalmond, walnut, &c., "cream."

The better quality oils are quite as wholesome as the bes

these transformations all the other physical properties of a substance save weight are likely to change, the inquiry arises, Does the weight also change? Much careful experimenting has shown that it does not. The weight of the products formed in any change in matter always equals the weight of the substances undergoing change.

~Law of conservation of matter.~ The important truth just stated is frequently referred to as the law of conservation of matter, and this law may be briefly stated thus: Matter can neither be created nor destroyed, though it can be changed from one form into another.

~Classification of matter.~ At first sight there appears to be no limit to the varieties of matter of which the world is made. For convenience in study we may classify all these varieties under three heads, namely, mechanical mixtures, chemical compounds, and elements.

[Illustration: Fig. 1]

~Mechanical mixtures.~ If equal bulks of common salt and iron filings