UNIDENTIFIED VITAMINS 



71 



TABLE I 

 Coenzyme R, Biotin and Vitamin H 



Coenzyme R 



(growth and respiration promoting effects 

 of extracts for Rhicobimn trifolii; Allison, 

 Hoover and Burk [1933]) 



Biotin 



(yeast-growth factor; 



K5gl [1935]) 



Vitamin H 



(rat nutrition 

 Gyorgy [1939]) 



CH.. CH(CH04CO,H 



Biotin 



TABLE II 

 Folic Acid and Possible Chemically Related Factors 



Vitamin M 



Norite eluate factor 

 Vitamin Be 



Factor R 



Folic acid 



Liver L. casei factor 

 Streptococcus lactis R factor 



Vitamins Bio and Bn 



Fermentation L. casei factor 



Vitamin Be conjugate 



for cytopenia in monkeys 



for growth of L. casei 



for anemia (macrocytic 

 hyperchromie type) in 

 chicks 



for chicks 



for growth of S. lactis 

 and L. casei 



for chicks 



for chicks 



Day, Langstron, and Darby 



(1938) 

 Snell and Peterson (1939) 

 Hogan and Parott (i939) 



Schumacher, Heuser, and 



Norris (1940) 

 Mitchell, Snell, and Williams 



(1941) 

 Stokstad (1943) 

 Keresztesy, Rickes, and 



Stokes (1943) 

 Briggs, Luckey, Elvehjem, 



and Hart (i943) 

 Hutchings, Stokstad, Boho- 



nos, and Slobodkin (i944) 

 Pfiffner, Calkins, O'Dell, 



Bloom, Brown, Campbell, 



and Bird (i945) 



