248 THE AMERICAN MONTHLY [October. 



surface of the leaf He explained the cases in which that instru- 

 ment may be employed to some advantage. 



Mr. Marsland exhibited an improved moist chamber made of 

 zinc. 



Mr. Dales showed his "home-made" lighting apparatus, con- 

 sisting of an iris diaphragm in a hard-rubber substage which could 

 be swung out of the way if he wished to change the condenser. 



Mr. Woods exhibited specimens of chara collected in the sand 

 hills and thrown into a weak solution of glycerine in which a 

 little carbolic acid had been dissolved. In this way they had 

 been preserved in a very good condition a long time. He used 

 but one or two per cent, solution of carbolic acid. 



NEW PUBLICATIONS. 



Catalogue of Photographic Lenses. The Bausch & Lomb 

 Optical Co., Rochester and New York city. 



Like this firm's catalogue of microscopes and objectives, this 

 list is a work of art, a beautiful specimen of what an intelligent 

 printer can do with the types when he tries and when he has the 

 help of the paper-maker. The contents, too, will charm the pho- 

 tographer, for the catalogue describes not only the best of the 

 firm's own lenses, with those of Clark, the celebrated manufac- 

 turer of telescopes, but it introduces an entirely new series, the 

 Zeiss anastigmat lenses, made from the new Jena glass after 

 formulae worked out by Prof Abbe, with whose work all micros 

 copists are familiar. These new photographic productions, for 

 which Bausch and Lomb hold the patent for this country, seem 

 to have valuable qualities. 



Drs. Bourneville and Br icon's Matmal of Hypodermic Medi- 

 cation. Edited by G. A. Stock well, M. D. Square i6mo, 

 pp. 158. Detroit: Geo. S. Davis. Price 25 and 50 cents. 



This is the most valuable number of the Physician's Leisure 

 Library Series that has been issued for a long time. It is so im- 

 portant that every practising physician should have a copy within 

 his reach or on his desk for repeated consultation. It is full of 

 suggestions that must bear fruit for the thoughtful man, and full, 

 too, of warnings that must be as valuable. We have seldom seen 

 a little manual that has so pleased us, or one that can be so 

 conscientiously commended to the medical student and to the 

 advanced practitioner. The price, too, is so low that every 

 physician can afford to buy it, as he may do with safety and with 

 the certainty of being pleased and instructed and helped. 



