76- ORIGIN OF THE 



CHAPTER VI. 



IT will be recollected, that all animals, even 

 at the present day, as then, require an immersion 

 in a liquid, of a uniform temperature, for the 

 primary development of their instinctive, or, 

 what may be termed, vegeto-animal growth. 

 The analogy of the animal to the vegetable, in 

 the embryotic stage of growth, is much stronger 

 than might be supposed. Both require heat and 

 humidity ; both receive liquid nutriment, through 

 ducts or tubes attached by fibrous appendages to 

 the object or place whence they receive their 

 nourishment ; and neither are capable of receiv- 

 ing vitality from the air, until the unfolding of 

 certain apparatus, which in the former are called 



