CONTENTS 



XI 



Page 



IX. Requirements and Factors Influencing Them 570 



A. Of Animals 570 



Henry A. Mattill 



B. Of Man 572 



Kakl E. Mason 



rHAPTKR IS. NEW AND UNIDENTIFIED GROWTH FACTORS 

 Vkunon II. Cheluelin 

 I. Lipoic Acid (Thioctic Acid, Pyruvate O.xidatiou Factor, Protogen, Acetate 



Replacement Factor) 575 



II. Carnitine (Vitamin Bt) 583 



III. Peptides 585 



IV. Lyxoflavin 588 



V. Coenzyme III 589 



\l. Factors Required in Unheated Growth Media 589 



VII. Guinea Pig Antistiflfness Factor 591 



VIII. Miscellaneous Factors 593 



Author Index 601 



Subject Index 643 



