1896.] MICROSCOPICAL JOURNAL. 191 



MICROSCOPICAL SOCIETIESs. 



Quekett Microscopical Club. 



The 340th ordinary meeting- of this club was held on 

 Friday, March 20th, Mr. J. G. Waller, president in the 

 chair. The minutes of the preceding- meeting- were read 

 and confirmed, ballot for new members taken, the addi- 

 tions to the library announced. Mr. Rousselet read a 

 paper "on Rattula co/laris, and other Rotifers." Mr. E. B. 

 Green read a further "Note on Root-Hairs," accompanied 

 by some beautiful drawing-s, which he presented to the 

 club. In answer to questions Mr. Green said all his obser- 

 vations had been made on common plants; no g-reenhouse 

 was required, and he had contrived a small case holding- 

 about 20 pots which would stand in any window, and by 

 means of which his experiments could easily be repeated 

 and extended. Mr. Karop gave an account of the life-his- 

 tory of the Mycetozoa, illustrating- his remarks by colored 

 diag-rams and black-board drawing's. After noting- the lit- 

 erature of this interesting- subject, he recommended every 

 intending- observer to procure Mr. Lister's "Guide to the 

 Brit. Mycetozoa," published by the trustees of the British 

 Museum, and to be had at South Kensington, or of the au- 

 thorized booksellers, price 3d. It contained a list of all the 

 known indig-enous species, and was well illustrated. The 

 secretary said that as the first Friday in April was Good 

 Friday, the usual conversational meeting- would, of course, 

 not be held. The next ordinary meeting- was on P^riday, 

 April 17th, and on the 18th, an excursion to the Royal Bo- 

 tanic Gardens. 



The 341st ordinary meeting- of this club was held on Fri- 

 day, April 17th. Mr. E. M. Nelson, exhibited and described 

 a new doublet bull's eye which Mr. Baker had made to his 

 formula, g-iving- a minimum of spherical aberration. By 

 projecting- the imag-e of a lamp flame on a wall he showed 

 that the usual "fluffy" margin was very materially reduced, 

 and he thoug-ht where it was necessary to fill a large field 



