FACTORS INFLUENCING B VITAMIN REQUIREMENTS 299 



* Neither are the data in this table complete, nor is the table a complete list. Rather is it meant to 

 indicate representative data, and includes only those cases where study has definitely shown synthesis 

 by the indicated organism. 



+ = synthesize the indicated B vitamin. 



diet could be suitably balanced so as to affect adversely the growth of 

 the bacteria without influencing the dietary requirement of the host. 187 

 Cecectomy has given some valuable data, but is technically difficult, and 

 therefore has been rarely used. 188 In addition, this technique creates a 

 different animal from the normal one — a factor worth weighing in both 



