242 SCIENTIFIC FEEDING OF ANIMALS 



stall, supply of salt, bedding, grooming, number 

 of meals, etc., must be kept the same in each group 

 or each period. 



The care which according to the above is essential 

 in the carrying out of an investigation may seem 

 to some to be exaggerated. It is only those who 

 know from experience how changeful an animal 

 is, and have critically studied the reports of in- 

 vestigations in practice, who cannot doubt that 

 the most strict care is essential in conducting such 

 investigations. He who does not or will not con- 

 sider these demands to be necessary had far better 

 not undertake investigations, for he will only 

 succeed in increasing the huge number of valueless 

 results. 



