author - "William Thomas Councilman"
ase of many animals itseems as though the necessity of a fluid environment for living matterdid not apply, for the superficial cells of the skin have no fluidaround them; these cells, however, are dead, and serve merely amechanical or protective purpose. All the living cells of the skin andall the cells beneath this have fluid around them.
Living matter occurs always in the form of small masses called"cells," which are the living units. The cells vary in form, structureand size, some being so large that they can be seen with the nakedeye, while others are so small that they cannot be distinctly seenwith the highest power of the microscope. The living thing or organismmay be composed of a single cell or, in the case of the higher animalsand plants, may be formed of great numbers of cells, those of asimilar character being combined in masses to form organs such as theliver and brain.
In each cell there is a differentiated area constituting a specialstructure, the nucleus, which contains a pe
ase of many animals itseems as though the necessity of a fluid environment for living matterdid not apply, for the superficial cells of the skin have no fluidaround them; these cells, however, are dead, and serve merely amechanical or protective purpose. All the living cells of the skin andall the cells beneath this have fluid around them.
Living matter occurs always in the form of small masses called"cells," which are the living units. The cells vary in form, structureand size, some being so large that they can be seen with the nakedeye, while others are so small that they cannot be distinctly seenwith the highest power of the microscope. The living thing or organismmay be composed of a single cell or, in the case of the higher animalsand plants, may be formed of great numbers of cells, those of asimilar character being combined in masses to form organs such as theliver and brain.
In each cell there is a differentiated area constituting a specialstructure, the nucleus, which contains a pe