LESSON ONE 
SORTING. OF ANIMALS 
Locomotion. 
Ameeba. 
Sponges. 
Hydra. 
Corals and jellyfish. 
Worms. 
Arthropoda. 
Mollusca. 
Starfish and sea urchin. 
10. Backbone animals. 
11. Fishes. 
12. Toads and frogs. 
13. Reptiles. 
14. Birds. 
15. Mammals. 
S000 AT G3 OE YR BO 
Note to the Teacher.—In this lesson are indicated the 
steps in development from the amceba, the lowest, to mam- 
mals, the highest, forms of animal life. Show in a general 
way how one form differs from the others immediately 
above or below it. The lesson starts with locomotion, a 
power possessed by animals but not by plants or only by 
those of the lowest orders. The first and earliest forms of 
life were one celled; then came two-layered animals; then 
three layered, with a body cavity where traces of the an- 
cestry of the backbone groups are found. Now come the 
fishes, with their gills; now the amphibia, with gills lost 
in the adults. From here we reach the reptiles, cold 
blooded, with true lungs; and then the birds, with their 
feathers; and finally the mammals, with their hair or fur. 
