A RECORD OF THE BODY WEIGHT 



AND CERTAIN ORGAN AND GLAND 



WEIGHTS OF 3,734 ANIMALS 



GEORGE CRILE AND DANIEL P. QUIRING 



The weight data presented in the following table are 

 offered in the hope that they may be of value to the biolo- 

 gist, physiologist, and particularly to the student of growth 

 phenomena. 



With few exceptions, marked with an asterisk, our own 

 data represent fresh weights taken immediately after the 

 animal was sacrificed. The larger animals were weighed on 

 a Chatillon scale of 600 pounds capacity; in the case of the 

 heaviest animals this necessitated quartering or cutting 

 the body into sections to fit the scale. The smaller animals 

 were weighed either on a Chatillon autopsy scale, a Cenoco 

 triple-beam balance, or an Ohaus beam balance. The 

 glands and organs, likewise, were weighed on these scales 

 except for the very small glands that were weighed on an 

 analytical balance. 



It will be noted that some records are more complete than 

 others; this is due in part to changes that were made in our 

 program over a period of some ten years and in part to the 

 impossibility of getting complete records for many of the 

 animals. No attempt has been made to arrange the groups 

 in order of relative development. A rough alphabetical 

 listing has been made. 



In connection with the degree of accuracy of the weights, 

 these have, in some instances, been carried beyond the limits 

 of error. Generally, however, we have attempted to hold 

 to an accuracy of i per cent. In the case of animals that were 

 weighed in pieces, we allowed 5 per cent for loss of blood and 

 body fluids. All weights represent the body weight plus 

 whatever mass was present in the stomach and intestine. 



281 



