ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 667 



the positive pole while the silver remains at the negative, being free to 

 combine with the tissue elements. 



By fixing unimpregnated tissue to the positive pole an acid reaction 

 is obtained, and this makes the tissue more receptive of the silver salt. 

 In a similar way by placing pieces of tissue on the anode or cathode 

 the tissues may be rendered acid or basic, so as to mordant them as it 

 were for basic or acid stains. 



(6) Miscellaneous. 



Microtomists' Vade Mecum.* — The new edition of the Microto- 

 mists' Vade Mecum, a handbook of the methods of Microscopic Anatomy, 

 by A. Bolles Lee, contains much new matter, room for which has been 

 found by condensation and rearrangement. Some chapters, e.g. on 

 connective tissues and on blood and glands, have been practically re- 

 written, and those on the nervous system have been elaborated and 

 much new and important matter added. The Microtomists' Vade Mecum 

 is so well known and so universally consulted by every class of histolo- 

 gist that it is unnecessary to launch out into praises of its many merits, 

 and it only remains to congratulate the author on his energy in bringing 

 his invaluable work up to date. 



Ball, M. V. — Essentials of Bacteriology. London: Kimpton, 1904, 4th ed. 



Klopstock, M., u. Kowarskt, A. — Praktikum der klinischen, chemisch-mikros- 

 kopischen und bakteriologischen TJntersuchungsmethoder. 



Wien : Urban u. Schwarzenberg, 1904, 296 pp. 



Lindner, P. — Mikroskopische Betriebskontrolle in den G-arungsgewerben mit einer 

 Einfuhrung in die technische Biologie, Hefenreinkultur und Infektionslehre. 



Berlin : Paul Parey, 1905, 4th ed. enlarged, 

 521 pp., 237 figs., 4 pis. 



Lynch, K. — Mikroskopische Untersuchung der Faces. Ihre Bedeutung und ihre 

 Anwendung in der artzlichen Praxis. Leipzig : G. Thieme, 1904, 35 pp. 



Miethe, V. — Traite pratique de recherches bacteriologiques. 



Paris : Malonie, 1904. 



S^ons, Ph. — Lehrbuch der Histologie und der mikroskopischen Anatomie des 

 Menschen mit Einschluss der mikroskopischen Technik. 



Jena: G. Fischer, 1905, 456 pp., 352 figs. 



Winslo w, Ch.-E. A. — Elements of Applied Microscopy. A Text-book for Beginners. 



New York: John Wiley and Sons, 1905, 183 pp. 



Metallography, etc. 



Thermal and Electrical Effects in Soft Iron.f — E. H. Hall, 

 Churchill, Campbell and Serviss have made delicate measurements of 

 the Thomson effect. Two bars of iron (99*98 p.c. Fe) were employed, 

 one end of each bar being inserted in a mixture of ice and water, the 

 other end in boiling water. An electric current (25 amperes) was passed 

 through the bars, from cold to hot in one bar, from hot to cold in 

 the other. The direction of the current could be reversed. The 



* London : J. and A. Churchill, 6th ed., 1905, x. and 538 pp. 

 t Proc. Amer. Acad. Arts and Sci., xli. (1905) pp. 23-55. 



