FIG. 28. 



This photograph represents the condition shown by a young rat which is suffering from a 

 deficiency of water-soluble B. There is no co-ordination of the movements of the hind quar- 

 ters, and the animal is unable to use the hind legs, which may be seen stretched out in a help- 

 less manner. This animal showed a rapid recovery from this condition and was able to walk 

 about with ease twenty-four hours after a dose of yeast extract had been given by the mouth. 



From Special Report Series No. 38. By permission of the Medical Research Council. 



