274 Proceedings of the Royal Society of Victoria. 



Til a few cases where, instead of the name of the authority 

 for the weight, the word " calculated " occurs, it means that, 

 being unable to find the weight of a species, but having 

 discovered that of a closely allied species, presumably of the 

 same shape, I have calculated the weight of the one from 

 that of the other on the assumption that they are proportional 

 to the cubes of the lengths. 



If we apply the same sort of investigation to the Mammalia as 

 a whole, we find that for the period of gestation the law 



holds with only moderate accuracy. But if we consider any one 

 order at a time, the coincidence of observed and calculated times 

 is sufficient to establish the law conclusively. For instance, the 

 following is a list of all the carnivora for which I can obtain 

 information. For this order the constant n is equal to 41. 



