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^ 1^ fv-. m u 第 る 第 せ. m 



Fij?. 9. Diagi'amatic figures showing the size variation of the eye- 

 spots in the intersjpaees I-l I I on the under surface of the hind. wino. 

 1 n a, the spots are the largest, and ail the three are united ； in b, the 

 spots are middie— sized, and. only the hindmost is isolated. ； in c; the 

 spots are the smallest, and all the three are isolated. X 2, 



THE VARIATlON^ m THE SIZE OF THE EYE-SPOTS. 



On the under surface of the liind wings, a series of spots is present 

 in the interspaces I - III. In some cases in which these spots develop 

 well, all the three are united into a chain, the yellows of the adjoining 

 two spots touching with each other (iMg. 2. a). But the more the spots 

 diminish in size, the looser becomes the connection ； so, in the next stage 

 the hindmost spot (in the interspace I) becomes independent of the 

 others (め； and when the last stage is attained, all the spots on the under 

 surface are the least conspicuous and the two spots which have been 

 united in the previous stages become separated from each other {c). Thus 

 it is very convenient to see the interrelations of these spots, in order to 

 determine roughly the degree of development of the spots on the under 

 surface. We liave thus three kinds oi iiidi vidua Is classified according to 

 the criterion given above. The relative frequencies of these forms are 

 shown in Table VI It clearly shows that generally the size of these 

 spots is more reduced in the spring generation than in the subsequent 

 ones, and in the males than in the females. 



SOME COXCEUDING REMARKlS. 



As is stated above, all the adventitious spots are usually small and 

 incomplete, only rarely they bt'uvj as large and perfect as the normal 

 ones. T. ne latter, on the contrary, are almost invariably well-formed. 

 Thus all the normal spots are very stable in their appearance, the direc- 



