ZOOLOGY AND BOTANY. MICROSCOPY. ETC. 745 



Microscopy of Technical Products.* — A. L. AVinton, in collabora- 

 tion with Kate Ct. Bar])er, has translated Hanausek's useful and well- 

 known text-book, The Microscopy of Technical Products. After a 

 short description of the Microscope, its accessories, and of micro- 

 technique, the author passes on to the microscopy of the most important 

 types of technical raw material, such as starch, vegetable and animal 

 fibres, stems and roots, leaves, flowers, fruits, and seeds. Most of the 

 volume is devoted to the foregoing, the characters of teeth, bone, and 

 horn being summed up in one short chapter. The last section of the 

 work deals with michrochemical analysis. Hanausek's work is already 

 so well known in its original garb that it seems almost unnecessary to 

 point out that its object is to teach by the aid of the Microscope how to 

 identify technical products, and at the same time to inculcate the 

 fundamental principles of vegetable histology, and the histology of 

 certain animal materials. The translator and his collaborator are to be 

 congratulated on the result of their task, more especially as the present 

 volume is an augmented and revised edition of the last German w^ork. The 

 volume is admirably got up, and copiously and excellently illustrated. 



Quekett Microscopical Club. — At the 4-i2nd Ordinary Meeting of 

 the Club, held on October !«, the President, Dr. E. J. 8pitta, F.R.A.S., 

 F.R.M.S., in the chair, the following papers were read. 



A note by Mr. E. M. Nelson, F.R.M.S., on a new semi-apochromatic 

 ^ inch objective computed by Mr. A. E. Conrady, F.R.M.S., and made 

 by Messrs. Watson and Sons ; a note on " Three Water-mites new to 

 Britain, Thyopsis cancellata Protz, Sperchon glandulosus Koen, and 

 Lyania hipapillata Thor," communicated by Mr. G. P. Deeley ; a note 

 on " Secondary Markings in Navicula Smithii,'''' and a note on " Secondary 

 Markings in Navlcula crahro Ehr. (iV. pandura Breb.)," both by Mr. 

 A. A. C. Eliot Merlin, F.R.M.S. ; and a resume by Mr. F. P. Smith of 

 a valuable paper on " British and Foreign Pseudo-Scorpions," by Mr. 

 Edv. Elhngsen, of Kragero, Xorway. The paper gives descriptions, 

 mostly at length, of some 20 species of this order belonging to the 

 genera Chelifer, Chiridium, Ideobisiuni, Obisium, and Chthonius. 



B. Technique, t 

 (1) Collecting- Objects, including- Culture Processes. 



Natural Culture of Trichomastix serpentis.| — C. C. Dobell exa- 

 mined the fluid from the rectum of a rattlesnake dead of canker of the 

 mouth. The fluid, which was brownish, almost odourless and alkaline, 

 was transferred to a glass dish and covered with a tliick glass plate 

 fixed down with vaselin. In tliis fluid the parasites lived for about 120 

 days, increasing in number for some five or six weeks, when they reached 

 their maximum, afterwards gradually dying out. Attempts to cultivate 



* New York : John Wilev and Sons ; London : Chapman and Hall, Ltd., 

 1907, xii. and 471 pp., 276 figs." 



t This subdivision contains (1) Collecting Objects, including Culture Pro- 

 cesses ; (2) Preparing Objects ; (3) Cutting, including Imbedding and Microtomes ; 

 (4) Staining and Injecting ; (5) RIounting, including slides, preservative fluids, etc. 

 (6) ^Miscellaneous. 



X Quart. Journ. Micr. Sci., li. (1907) pp. 449-50. 



