FULLER QUOTATIONS FROM ' ZOONOMIA? 2 19 



of puberty, the beard and other great changes in . the 

 form of the body and disposition of the mind are pro- 

 duced in consequence of new developments ; for, if the 

 animal is deprived of these developments, those changes 

 do not take place. These changes I believe to be 

 formed not by elongation or distension of primeval 

 stamina, but by apposition of parts ; as the mature 

 crab fish when deprived of a limb, in a certain space of 

 time, has power to regenerate it ; and the tadpole puts 

 forth its feet after its long exclusion from the spawn, 

 and the caterpillar in changing into a butterfly acquires 

 a new form with new powers, new sensations, and new 

 desires." * 



****** 

 " From hence I conclude that with the acquisition 

 of new parts, new sensations and new desires, as well 

 as new powers are produced ; and this by accretion to 

 the old ones and not by distension of them. And finally, 

 that the most essential parts of the system, as the brain 

 for the purpose of distributing the powers of life, and 

 the placenta for the purpose of oxygenating the blood, 

 and the additional absorbent vessels, for the purpose of 

 acquiring aliment, are first formed by the irritations 

 above mentioned, and by the pleasurable sensations 

 attending those irritations, and by the exertions in con- 

 sequence of painful sensations similar to those of hunger 

 and suffocation. After these an apparatus of limbs for 

 future uses, or for the purpose of moving the body in 

 its present natant state, and of lungs for future respira- 

 tion, and of testes for future reproduction, are formed 

 * ' Zoonoinia,' vol. i. p. 498. 



