OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 



49 



TABLE II. VERTEX TO COCCYX LENGTH, THE LENGTH OF LIMBS AND THE RATIO BETWEEN THEM, 



THE FORMER BEING TAKEN AS 1. 



SYNOPSIS OF RESULTS FROM COMPARISON OF THE MEASUREMENTS OF THE PENGUIN 



AND DUCK. 



1. Length of Trunk. 



At early stages the length of the trunk of the penguin is much less than that of 

 the duck of corresponding age the proportion being that the penguin at the 12th 

 day is almost exactly one-half of the length of the duck at the same age. 



As development proceeds the penguin grows more rapidly, until at the end of 

 incubation the penguin is only fractionally shorter than the duck. 



2. Length of Fore Limb. 



At corresponding dates after the limbs first appear the fore limb of the penguin is 

 only about one-fourth of the length of that of the duck. 



Its growth subsequently is much more rapid, and at the three weeks it is almost 

 the same size, and at the end of incubation it exceeds in length the duck's fore limb, 

 in some specimens by as much as one-quarter. 



3. The Ratio of Length of Upper Limb to Trunk. 



At the 12th day of incubation the fore limb of the penguin measures approxi- 

 mately in length one-fourth (index, "2 5) of the length of the trunk, while in the duck 



(ROY. SOC. EDIN. TRANS., VOL. XLVH., 235.) 



