Vegetative Nucleus — 157 — Von Baer's Laws 



Vitamin C. — CgHgOg. The water-soluble, readily-oxidisable, 

 anti-scorbutic vitamin; ascorbic acid; hexuronic acid. 



Vitamin D. — The anti-rachitic, fat-soluble vitamin. See Cal- 

 ciferol and 7-Dehydrocholesterol. 



Vitamin E. — The reproductive, fat-soluble vitamin. It is 

 resistant to heat, light and oxidation. See Tocopherol. 



Vitamin G. — Vitamin Bg, q.v. 



Vitamin K. — This controls the coagulating power of blood. 

 Its composition is possibly 2 methyl-3-hydroxy-l :4 naphtho- 

 quinone. 



Vitamin P. — A flavone derivative concerned with perme- 

 ability; citrin. 



Vitelline Body. — Yolk nucleus, q.v. 



Vivipary. — (i) The replacement of the floral structures by a 

 vegetative outgrowth capable of developing into a new plant, 

 (ii) Giving birth to living offspring (as opposed to laying 

 eggs from which living offspring subsequently hatch). 



Von Baer's Laws. — (i) In development from the egg the 

 general characters appear before the special characters, (ii) 

 From the more general characters the less general and finally 

 the special characters are developed, (iii) During its develop- 

 ment an animal departs more and more from the form of other 

 animals, (iv) The young stages in the development of an 

 animal are not like the adult stages of other animals lower 

 down on the scale, but are like the young stages of those 

 animals (de Beer), 



