﻿晁^ 學雜誌 第 參卷第 壹？) j£ 



THE PROCESS OF DEVELOPMENT OF THE KYE-SPOTS. 



The process of development of an imperfect eye-spot into a perfect one 

 varies, but. this is fairly constant in the same spot. In the eye -spots ou 

 the under surface, the succession of three components invariably follows 

 in the order of yellow, black and the pupil. The yellow of any new 

 spot, which is formed in an interspace adjacent to another normally with 

 usual one, is generally connected with the yellow of the latter; however, 

 if the formation occurs elsewhere, it is carried out quite independently of 

 any other spot. On the upper surface, in the interspaces IV - VI of the 

 hind winr^s, black appears first, which is either surrounded by yellow 

 scales or furnished with a pupil ； finally it develops into a perfect spot 

 with the complete set of components. But, in the interspace I, two 

 groups of yellow scales appear first, correspondingly to the two pupils of 

 the spot on the under surface ； these yellows arc followed by the black 

 scales and then by the pupil ； thus two spots may be formed in this 

 interspace. 



VARIATION IX THE :s UMBER OF TITE EYiS-SPOTS. 



1 he relative numbers of individuals provided with the a. ntilious 

 spots were calculated. Tne data are shown in Tables 111 - V. It must 

 be noted before entering into detailed statements, that in these tables as 

 well as in descriptions so far as the number of spots are concerned, the 

 degree of development for convenience's sake is lefi out of consideration; 

 and that the tables deal solely with the data on the iigiu wings, as they 

 are practically identical on either wing, and any reference to both sides 

 would be unnecessary. 



In Table III are shown the data concerning- the fi\ qucncies of the 

 individuals provided with the eye-spots in the interspaces V and VI on 

 the upper surface of the hind wing. A condition which deserves our 

 special notice here is the distinction between the individuals of the dif- 

 ferent generations. In the males, the individuals belonging to Lots I， V 

 and X, i e., those of the spring generation, are more frequently provided 

 with the spots than those of other p-enerations. Similar tendency is 

 recognizable, although more vaguely, in either sex of Table IV which 



