CHAPTER LIV. 

 ZOOLOGY. 



CLASSIFICATION OF ANIMALS VERTEBRATES AND INVERTEBRATES 

 PROTOZOA HYDROZOA ACTINOZOA. 



ZOOLOGY treats of life of organized beings which are capable of volun- 

 tary motion. Plants exist, animals live and move. Both are organic 

 beings, but the latter possess the faculty of will and spontaneous movement. 

 The animal can leave a place and enjoy other surroundings, the plant 

 cannot. We have already crossed the borderland which connects the 

 plant and the animal. We have seen plants almost animals. We could 

 commence this section with animals which are almost plants, so closely 



do the divisions approach each other. 

 ZOOLOGY is the science of the knowledge 

 of animals as BOTANY is of the knowledge 

 of plants. ( 



Where there is vegetation there are 

 animals, not quadrupeds or bipeds neces- 

 sarily, but numbers of small, it may be in- 

 visible, creatures which exist upon the 

 vegetable kingdom the algae and minute 

 creations of globules and cells, the infusoria 

 already mentioned, the corals, etc. And 

 in the "protozoa," or first specimens of 

 animal life, we have a similarity to the 

 vegetable kingdom ; we then get by gradual 

 steps to other more perfect beings, each 

 after his kind, till we arrive at the most 

 perfect animal MAN. 



Animals are divided into two families, the INVERTEBRATE and the 

 VERTEBRATE. The former has no spine nor skeleton ; the latter has both. 

 These again are divided into sub-families, classes, and orders, as follows. 



Man is an animal but what is an animal ? We can scarcely tell in 

 a few words. Linnaeus defined the difference between the animal and the 

 plant, for the former, said he, live, grow, and feel, while the latter live and 

 grow, We have protozoa in the animal kingdom consisting of a single cell 



