VI 



accept the conclusions which the author has arrived at ; 

 but on this subject I will say nothing more for the present. 



I have abstained from comment throughout the paper as 

 much as possible, partly for the reason that I do not wish 

 either to overburden the essay with footnotes^ or to distract 

 attention from the main theme, and partly because 1 have in 

 hand what I trust will prove an exhaustive account of the 

 whole pterylography of the bird^'s wing, in which it is hoped 

 that_, amongst other thingSj the mystery of mysteries, — 

 aquintocubitalism, — will be solved. It remains, therefore, 

 only to say that all side-issues arising out of the present paper 

 will be treated of thoroughly in my coming contribution, 

 which has been aided materially by Mr. Degen's work. 



W. P. PYCRAFT. 



Dept. Comparative Anatomy, 



University Museum, Oxford. 



June 20, 1894.. 



