1897] MICROSCOPICAL JOURNAL 29 



tention. is th;it;in <)l)iL'ct alwuys ;ii)i)cai's lo lie in that direc- 

 tion in which the rays of lig-ht hist reach the eye. It was, 

 Mr. Allen said, a hig-hly important principle, which was 

 sometimes not so thorou^-hly hoi-ne in mind as it should be. 

 Mr. Allen then described the laws of ()])tics utilised in the 

 construction of the microscope, illustrating- his observa- 

 tions by numerous demonstrations carried out bv means 

 of a beam of light. He also ex]dained the mag^nifying" 

 I)Ower of different object glasses and eye-pieces, and dealt 

 in a chatty but interesting and instructive way with other 

 details connected with the optical construction of the mi- 



ci'oscope. 



Liverpool Microscopial Society. 



"The Microscopic Study of Cotton and other Fibres," 

 was the subject which Mr. F. H. ^Fate, K.C.S., discussed 

 before the members of the Society recently. The paper 

 dealt ])rincipally with cotton, and described the structure, 

 mode of growth and development of the fibres. ^Fhe dif- 

 ferent structures of the plant were exhibited by lantern 

 illustrations and their several characteristics were ex- 

 ])lained. Micro-photograjihy was relied upon to reveal the 

 difference between healthy antl diseased fil)res. The 

 fibres of other materials, as wool, silk, Hax, etc., were simi- 

 larly described and exhibited. 



Quekett Microscopical Club. 

 The .■^4()th ordinarv meeting of this clul) was held on 

 Friday, Nov. 2<>th, at 20, Ilanover-square, Mr. J. G. Wal- 

 ler, president, in tile chair. Mr. T. Rosseter, K.K.M.S., 

 read a jiapei" on a new Cysticercus and Taenia. The for- 

 mer infests the entoniostracan, Cvpris fusca, and the ma- 

 ture tapeworm develops in the common ducl\. Mr. Ros- 

 seter gfave a most interesting account of his ex]>eriments 

 in feeding the birds with the entomost raca. his frequent 

 failures, and final success. The paper was illustrated by 

 drawing's of the various stages and details of structure, as 

 well as ])V diag'rauis on tin- board. In moving a vote of 

 thanks, the pi'esident remarked tiiat Mr. Rosseter ap- 

 peared to be tile sole in vestig"ator of tliese parasites, so far 



