-374 SUMMARY OF CURRENT RESEARCHES RELATING TO 



notably, silver methods by Dr. Mosse, gold methods by Prof. Szymono- 

 wicz, Golgi's method and its modifications by Prof. Kallius. 



The methods applicable to various special tissues such as the sense- 



•organs, and especially the nervous system, are very fully described. From 



•even the few articles we have indicated it will be seen that the work 



under notice is a veritable storehouse of exact information, and forms 



-an invaluable adjunct to the laboratory equipment of the working 



microscopist ; and we feel certain that as such it will be warmly 



welcomed and heartily appreciated. 



Eyre's Bacteriological Technique.*— It is difficult to praise too 

 highly J. W. H. Eyre's Elements of Bacteriological Technique. Though 

 it claims only to be a laboratory guide for the medical, dental, and tech- 

 nical student, it is much more than this, and no doubt its practical 

 usefulness will be appreciated by many superintendents of bacterio- 

 logical and clinical laboratories. The author describes with unusual 

 ■clearness the apparatus, methods, media, &c. required for the detection 

 and demonstration of microbes in the living and the dead, and in 

 •earth, air, and water. These descriptions are aided by numerous illus- 

 trations, nearly all of which have been prepared specially for this 

 volume, and about which the author cogently remarks that a good 

 picture possesses a higher educational value and conveys a more accurate 

 impression than a page of print. Besides technique there are chapters 

 •dealing with the morphology of the Hyphomycetes and Blastomycetes, 

 .and with the anatomy, physiology, and biochemistry of the Schizo- 

 mycetes ; while another section gives the outlines for the study of 

 pathogenic bacteria. There is no doubt that this work will appeal 

 strongly to medical and dental students, but it ought also to technical 

 students generally, for it contains all the laboratory information and 

 instructions requisite for brewing, dairying, and agriculture. Though 

 the limits of our space prevent us from doing justice to this eminently 

 practical guide, we may express the conviction that it will be highly 

 ■appreciated and extremely successful. 



JiRAiTs, K. — TJeber erne neue regulierbare Vorrichtung fiir den heizbaren Objekt- 

 tisch. (An apparatus for keeping the water on the not stage at a constant tem- 

 perature.) CentraJbl. Bald., 1" Abt. Orig., XXXII. (1902) pp. 467-9 (1 fig.). 

 „ TJeber einen Apparat zur bakteriologischen Wasserentnahme. (An 

 .apparatus for obtaining water for bacteriological examination.) 



Tom. cit., pp. 409-71 (2 figs.). 



Metallography, &c. 



Microscopic Appearances of Volcanic Dust.f — T. Andrews, in a 

 lecture given at the University of Cambridge, demonstrated the mag- 

 netic properties of volcanic dust and the effect of polarised light thereon. 

 The author also described the appearance of the volcanic dust ejected 

 from Mont Soufriere, St. Vincent Island. This dust consisted of minute 

 particles of varying size, the majority being more or less transparent. 

 The largest grains seemed mostly to consist of volcanic glass, in which 

 .gas was frequently occluded in internal cavities. The medium-sized 



* W. B. Saunders & Co., Philadelphia and London, 1902, 371 pp., 170 figs. 

 t Engineering, lxxv. (1903) pp. 195-9. 



