332 



Mr. Ingpen inquired the exact diameter and power of the 

 negative lens, and was it a simple or an achromatic lens, as in 

 the Barlow lens of a telescope ? 



Mr. Hardy said it was a simple bi-concave, about the same 

 focus as the length of the tube. He did not find it affected the 

 achromatism. 



The Secretary announced the forthcoming meetings. 



October 6th, 1893. — Conversational Meeting. 



CalUdina fusca, n. sp Mr. David Bryce. 



Litus cy7iipseus, c? ? (Fairy Flies) ... Mr. C. Machin. 



Ilercotheca mammillaris; from Howard's ) 



n^r. « T>- T, 1 \T f Mr. H. Morland. 



U-rove, near itichmond, V a. ... j 



Melicerta ri?igens (mounted) ... -\ 



CScistes mucicola (mounted) ... v Mr. C. liousselet. 



Melicerta Janus (mounted) ... J 



Oristahella miicedo . . . ... ... ... Mr. H.M. Simmonds. 



The Microscope and How to Use it. By T. Charters White, 

 M.R.C.S., F.R.M.S. 

 The second edition of this little book by our old member and 

 former president has just been published by Sutton and Co., 

 Ludgate Hill. Written entirely for beginners, it omits nothing 

 in the way of elementary manipulation likely to be required 

 by a novice, and there are many practical hints of one kind or 

 another scattered throughout the book, which would not be 

 lost on those who have already acquired more than the rudi- 

 ments of microscof)y. The chapter on photomicrography is 

 simple, concise, and to the point, and sufficiently explains the 

 technique of this increasingly popular branch to those who 

 have no previous acquaintance with it. The book is illustrated 

 by some excellent photographs of insect parts, diatoms, etc., 

 taken by the author, and as an introductory manual it can be 

 cordially recommended. 



NOTICE. 



The " Hailes Collection " of dredgings, soundings, etc., has 

 now been arranged by Mr. B. W. Priest, and is at the disposal 

 of Members. Application for portions of the same must be 

 made to the Committee. 



