112 ELEMENTARY ZOOLOGY. 



7. Alternation of generation. Where found. Its essen- 

 tial meaning. How does it differ from metamorphosis? 



8. Differences in the eggs of animals in size, shape, 

 envelopes, amount of non-living food substance, etc. 

 What classification of ova do the text-books make? 



120. Technical Terms to be Defined. Egg, ovum, fertilization, 

 embryo, parthenogenesis, artificial fertilization, hatching, birth, 

 metamorphosis, larva, pupa, morula, gastrula, ectoderm, entoderm, 

 heredity, environment, hermaphroditism, sexual dimorphism. 



