xxiv Proceedings. [March 12th, rgoo. 



The series of culture plates which were exhibited, shewed 

 the presence of many hundreds of colonies of several species of 

 micro-organisms in the lymph which had not been mixed with 

 glycerine, and the gradual reduction in the numbers of these 

 colonies in glycerinated lymph at the ends of lengthening 

 periods, until at the last, in a culture plate which had been 

 })oured at the end of four weeks after glycerination, the lymph 

 was shewn to be perfectly i)ure, all micro-organisms of every 

 kind having been eliminated. 



Especial thanks were expressed to Dr. S. Monckton 

 Copeman, of the Local Government Board, for the provision 

 of the culture plates and a number of photographs exhibited. 



[Microscopical and Natural History Section ^^ 

 Ordinary Meeting, March 12th, igoo. 



Charles Bailey, F.L.S., President of the Section, in the Chair. 



Mr. Mark. Stirrup, F.G.S., exhibited si)ecimcns of Mag- 

 netite from Hey Tor, Devonshire, and Granite, with excep- 

 tionally large Felspar crystals, from the same neighbourhood. 



Mr. Mark L. Sykes exhibited under the microscopes 

 rotifers, Stephafioceros and Floscularia, mounted by a new method, 

 shewing the tentacles expanded as in life. 



