On Transmission of Proteosoma to Birds l>y the Mosquito. 443 



March 16, 1899. 

 The LOED LISTEK, F.E.C.S., D.C.L., President, in the Chair. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The CROONIAN LECTURE, " On the Eelation of Motion in Animals 

 and Plants to the Electrical Phenomena which are associated with it," 

 was delivered by Professor BURDON SANDERSON, F.E.S. 



The following Papers were read : 



I. " Experiments in Micro-metallurgy : Effects of Strain." By Pro- 

 fessor EWING, F.E.S., and W. EOSENHAIN. 



II. " On Transmission of Proteosoma to Birds by the Mosquito : a 

 Eeport to the Malaria Committee of the Eoyal Society." By 

 Dr. C. W. DANIELS. 



The Society adjourned over the Easter Eecess to Thursday, 

 April 20th. 



" On Transmission of Proteosoma to Birds by the Mosquito : a 

 Eeport to the Malaria Committee of the Eoyal Society." By 

 Dr. C. W. DANIELS. Communicated by Dr. M. FOSTER, 

 Sec.E.S., by direction of the Malaria Committee. Eeceived 

 February 13, Eead March 16, 1899. 



I have the honour to report the results of my observations since my 

 arrival here (Calcutta) on December 21, 1898. 



2. Major Eonald Eoss, I.M.S., after demonstrating and explaining to 

 me his method of dissecting the mosquito, showed me in prepared 

 specimens the pigmented bodies met with in the stomach walls of mos- 

 quitoes fed on birds infected with Proteosoma, and also the changes 

 which these bodies undergo day by day. Finally he demonstrated to 

 me the " germinal threads " in cysts in the stomach wall, in the fluids 

 of the body, and in the cells of the veneno-salivary glands. 



3. On my arrival there were in the laboratory, in test-tubes, several 

 series of mosquitoes which had fed on birds infected with Proteo- 

 soma on the nights of November 30, December 10, December 12, 

 December 15, and December 20. 



