( vi ) 



doing any cutting.* The action is precisely that of a bee- 

 sting. 



A point, not mentioned by the exhibitor, came up in the 

 discussion, viz. that the saws were paired and not single saws. 

 This would, no doubt, in some way affect the manner of their 

 working, but as to how it would do so, no definite suggestions 

 were offered. The exhibitor inclined to think — considering 

 the structure of their " attachments " — that the saws work 

 simtdtaneotisly and not, as some have thought, alternately, but 

 he said that he did not venture to argue in defence of this 

 thesis without further investigation. 



Wednesday, March 3rd, 1909. 

 Dr. F. A. DiXEY, M.A., M.D., President, in the Chair. 



Election of a Felloiv. 



Mr. Francis Hamilton Lyon of Addlestone, Surrey, was 

 elected a Fellow of the Society. 



Exhibition^. 



Mendelisim in Acidalia virgularia, Hb. — Mr. L. B. 

 Prout, on behalf of himself and Mr. A. Bacot, brought for 

 exhibition a very extensive series of Acidalia virgularia, Hb., 

 bred in ten successive generations from various crossings of 

 the London and Hy^res race, which had been undertaken with 

 a view to the further study of Mendelism. The results showed 

 non-Mendelian inheritance, there being no segregation with 

 pure and hybrid forms in definite proportions ; and thus sup- 

 ported Mr. Bacot's opinion that such were only to be expected 

 in cases of hybridization of forms in which Natural Selection 

 had virtually eliminated intermediates, or in other words, that 

 apparent Mendelian phenomena were manifestations of selective 

 purity, lather than of gametic purity. 



* Eeainniir describes the alternate movement of the saws ; he clearly 

 believed that this involved withdrawal of one, during which actual sawing 

 took place, but his account, a better one than any one has given since, 

 leaves me satisfied that what he saw, was alternate advance, without 

 retraction. — T. A. C. 



