[Laboratory exercise], [5.]—External structure, [5.]—Internal structure, [7.]
III.—THE STRUCTURE AND FUNCTIONS OF THE ANIMAL BODY.
Organs and functions, [14.]—The animal body a machine, [14.]—The essential functions or life-processes, [15.]
IV.—THE CRAYFISH (Cambarus sp.).
[Laboratory exercise], [17.]—External structure, [17.]—Internal structure, [21.]
V.—THE MODIFICATION OF ORGANS AND FUNCTIONS.
Difference between crayfish and toad, [26.]—Resemblances between crayfish and toad, [27.]—Modification of functions and structure to fit the animal to the special conditions of its life, [29.]—Vertebrate and invertebrate, [30.]
VI.—AMŒBA AND PARAMŒCIUM.
[Laboratory exercise], [31.]—Amœba, [31.]—The slipper-animalcule (Paramœcium sp.), [34.]