KFFECTS OF DKl'dS OX WHIIE .MICE 



127 



On tlic top of the nest box is a Iced box 'A inches lon^i and 1 inch 

 wide witli two coni{)artinents. one for <i;i'ain, the oth(M' for ci'ackers 

 and milk. The feed box is lield in phice l)y a spring clip. An- 

 other clip holds a small wide moiitluMl bottle which is inverted. 

 This bottle contains the water or (hiii; which the mouse drinks. 

 In the nioutli of this bottle is a rubbei' stoi)j)er with an oi)enino; 

 thi'ou.iih it J inch in (Hameter. Throuiih this opening' a glass tube 



Fig. 1 lifvolvinji cuiies ami record ing dock.- 



f inch in diameter inside is insei'ted. The lower end of the glass 

 tube is drawn towards a point making an opening j inch in diam- 

 eter. This device compelled all the mice to drink directly from 

 the l)ottles. 



thp: (;i{()\\rn of the .mice 



The mice wei-e weighed at the beginning of tlie experiment 

 when they were eight we(>ks old. Thf\v were weighed once a 

 week during the next two months and once each month the n(^xt 

 fi\'e months. 



