xxii Proceedings. [January ijth, i goo. 



[Microscopical and Natural History Section. '\ 

 Ordinary Meeting, January 15th, igoc. 

 Chaui,es Bailky, F.L.S., President of the Section, in the Chair. 



Mr. Leonard Wilham Hunt was elected an Associate. 



A communication was submitted from the Royal Micro- 

 scopical Society on "The Standardisation of the sub-stage and of 

 the internal diameters of the draw-tubes of Microscopes." 



Mr. Mark L. Sykes, F.R.M.S., exhibited photographs and 

 specimens illustrating seasonal dimorpliism in some South 

 African butterflies of the genus Precis, worked out by Mr. Guy 

 A. K. Marshall ; also photographs and specimens of a butterfly 

 from Mashonaland and Durban, l)earing mimetic resemblance to 

 the common and distasteful Liiunas chrysippus, the two varieties 

 occurring together. 



[Microscopical and Natural I J is lory Sect ion ?\ 



Ordinary Meeting, February 12th, 1900. 



Thomas Roc^.ers, in the Chair. 



Mr. John R. Ragdale was elected an Associate. 



Mr. Mark L. Sykes, F.R.M.S., made a communication 

 on " The Elimination of extraneous micro-organisms from 

 Vaccine Lymph," and exhibited a series of poured culture plates 

 obtained from the Covernment laboratories, illustrating the 

 process by which the Bacteria in vaccine lymph are destroyed. 



The micro-organisms found in vaccine lymph and the variola 

 of smallpox were described, and illustrated by slides and photo- 

 graphs. Although a considerable number of species of bacteria, 

 Fovuhx; and other organisms are to be found, no specific 

 bacillus peculiar to smallpox has positively been discovered, 

 although several investigators have claimed to have identified it. 

 Of the many organisms found in vaccine lymph, and these vary 



