SUSPENSION OF GROWTH ON A MAINTENANCE DIET. 



73 



Table XXXIV. Hatai's Measurements of Stunted Rats from Experiments of 



Osborne and Mendel, 1910-191 i. 



Control Rats. 



Diet. 



Rat 96... Milk 

 Rat 97. . . Milk 

 Rat 99. . . Mixed 



Sex. 



Age in 

 days. 



Weight in grains of 



Body- 



Brain. I Cord. 



Hypo- 

 physis. 



Percentage 

 of water. 



Brain. Cord. Body 



Length in 

 mm. of 



Tail. 



Fern. I 178 1 54.9 1 .73460.49340.007378.30671 . 139 176 

 Fem. 178 164.51.69740.50070.009378.47371.2201 183 

 Male j 178 175.0,1 .85150.48100.005278.62371 .809 181 



Average 164.8 1 .76120.49370.0071 



78.46771.389 1 No 



Calculated from body-length Ii .76450.5004 78.374 



Estimated percentage of waterfrom age 1 ! i 78.4 



71 . 192 



71 .2 



180 



146 

 164 

 144 



151 



Body-length to tail-length 1 : 0.83 



Stunted Rats. 



Rat 100. . 

 Rat 101 . . 

 Rat 102. . 



Glutenin Fem. | 178 

 Glutenin Male j 178 

 Glutenin Male I 178 



85 .0 1 .63230. 40890. 003578. 141 70.775 148' 129 

 71 .8'i . 50220. 37810. 002278. 27271 .701 139; 108 

 85. 7! 1 .62800.39770.003378. 13371 . 134 148 125 



Average.. 1 80.8 



Calculated from body-length 



Estimatedpercentageof waterfrom age 



1 .58750.39290.003078. 18271 .203 145 121 



1 .58960.3639 



78.4 71.2 



145 



Body-length to tail-length 1 : 0.83 



Brain weight 



Formulas. 



, Body-length+134 \ , 



:o. 569 log (10- 23.7J+0.554 



43 



o 1 1 u 4 01 1 Body-length+134 



Spinal cord weight = 0.585 log (10 + 6) 0.795 



'43 



Percentage of water (brain) =82.62 2 log (Body-weight 10). 



Percentage of water (spinal cord) =85.206.5 log (Body-weight). 



Photographs of other rats which have been dwarfed in like ways 

 give evidence of the similarity of the stunts in general appearance 

 with normal animals of the same weight at a much earlier age. Thus, 

 in Plate 1, rat 305,0, weighing 5 5 grams at the age of 36 days, compares 

 favorably with rat 240, B, dwarfed on a gliadin food mixture, at the 

 age of 140 days, when it weighed 55 grams (cf. Chart CXIII). It is 

 interesting to contrast B with the uppermost photograph A of rat 

 238, likewise 140 days old and from the same brood but weighing 

 146 grams, the normal weight for this age. Each was raised under 



