40 PnOCEEDINGS OF THK 



The paper on which the Award is made is your work on " The 

 Spermatogenesis of Stemhothrus vir'uhdus ; with Si^ccial Kcferenco 

 to the Hcterotropic Chromosome as a Sex Determinant in Grass- 

 hoppers/' published in our Journal (Zoology) in 1911. 



I am ])articularly glad that the choice of the Council has fallen 

 upon this investigation of yours, because your work is, on the one 

 hand, in the field of cytological microscopy, demanding the utmost 

 skill in the use of advanced methods and the highest poAvers of tho 

 microscope ; Avhile on the other it is concerned with a fundamental 

 problem of Eiology of equal interest to the zoological and botanical 

 sides of our Society. On both these grounds we feel that we are 

 setting a fittingly high standard for future awards, worthy of the 

 intentions of the founder. 



The special interest of your work lies in its bearing on tho 

 question of the determination of sex, the insect you have investi- 

 gated being one of those in which the male has an odd number of 

 chromosomes in its somatic nuclei, while in the female the number 

 is even, the figures in this particular case being 17 and 18 respec- 

 tively. You have fully investigated the history of the spermato- 

 genic divisions, with special reference to the' behaviour of the 

 accessory or hcterotropic chromosome present in half the sperma- 

 tozoa, while lacking in the remainder. The result of fertilization 

 by the former is to produce females, by the latter to produce males, 

 the odd chromosome consequently being regarded by some as the 

 determinant of sex in these cases. You point out, with scientific 

 caution, that this conclusion is not yet absolutely established, but 

 the exact history of the process which you are able to give afPords 

 the best basis for the ultimate comprehension of its significance. 

 Your singularly accurate and beautiful work deserves the moro 

 credit as it was begun at a time when you Avere still under the 

 pressure of very different duties. 



I have great pleasure in handing you the Crisp Award, in recog- 

 nition of work which is of the best type of modern microscopical 

 research. 



Capt. Meek having received the medal and cheque, briefly 

 returned thanks, and expressed his gratification at being chosen 

 the first recipient of the a^ard. 



The President then addressing Prof. E. B. Poultox, handed to 

 him the Linnean Modal for transmission to Dr. Eobeet Cvril 

 Laytox Perkins, who was abroad, said: — 



Peofkssor Poulton, 



In the unavoidable absence of Dr. P. C. L. Pkekins, who is 

 abroad, 1 ask you to receive our Medal on his behalf. 



Dr. Perkins combines, in a rare degree, the qualities of an in- 

 defatigable field-naturalist and those of a skilled and precise 



