492 BIOLOGY. 



3042. With the formation of branchial fissures, into 

 the class Crustacea. 



3043. With the germination or budding forth of 

 limbs, into the class of Insects. 



3044. With the appearance of the osseous system, into 

 the class of Fishes. 



3045. With the evolution of muscles, into the class of 

 Reptiles. 



3046. With the ingress of respiration through the 

 lungs, into the class of Birds. The foetus, when born, is 

 actually like them, edentulous. 



3047. After birth it is suckled or fed. The milk is 

 the nutrition continued by means of albumen ; for the 

 mammae are verily only the albuminous vessels of the 

 Bird, which are placed free and external in the Mam- 

 miferous animal. After the time for sucking is past the 

 young one obtains teeth ; and thereby becomes for the 

 first time independent of the mother, and passes over 

 into the class Mammalia. Now, should the sketch here 

 afforded of these parallels be not in all respects correct 

 or justifiable, still sufficient proof remains, that a perfect 

 parallelism is found to take place between the develop- 

 ment of the foetus and that of the animal kingdom. 



3048. Animals are only the persistent foetal stages or 

 conditions of man. 



3049. Malformations are only persistent foetal con- 

 ditions, or animal formations in individual animal bodies. 



3050. Diseases are vital processes in animals. Pa- 

 thology is the physiology of the animal kingdom. A 

 human foetus is a whole animal kingdom. (Vid. Oken's 

 'Die Zeugung/ 'Beytrage zur vergl. Anatomic/ and 

 ' Ueber die Nabelbriiche/) 



Periods of Life. 



3051. If the young in the ovum or in the mother's 

 body resembles the aquatic animals, and has passed 

 through their organization ; so after birth does it belong- 

 to the air-breathing animals and traverse their orga- 

 nization. 



