114 SUMMARY OF CURRENT RESEARCHES RELATING TO 



collar by means of the screw-thread until the ruled glass is close to the 

 gelatin. The barrel is of such a length that the ruled glass may be 

 brought close to the gelatin in dishes of various depths. By means of 

 the jointed arm the lens is swung into place and may be carried over 

 the entire surface of the dish. The apparatus is made by Bausch and 

 Lomb. 



Fig. 33. 



Abba, F. — Manuale tecnico di microscopia e batteriologia applicate all' igiene. 



Torino (Claussen) 1902, 8vo, 671 pp., about 351 figs. 

 Cajal, S. Ramon y. — Elementos de Mstologia normal y de tecnica micrografica. 



3rd ed., Madrid, 1901, 8to. 



Ehrlich, P., Krause. R., Mosse, M., Rosin, H., und Weigert, C. — 

 Encyklopadie der mikroskopischen Technik mit besonderer Beriicksichtigung der 

 Farbelebre. Abt. 1, 2. 



Wien (Urban u. Scliwarzenberg), 1903, 8vo, 800 pp. and numerous figs. 



Gobham, F. P. — A Laboratory Course in Bacteriology. 



London (Saunders), 1901. Svo. 



Strasburgeb, E. — Das botaniscbe Prakticum. Anleitung zum Selbstudium der 

 mikroskopischen Botanik for Anfanger und Geiibtere, zugleich Handbucb der 

 mikroskopiscbeD Tecbnik. 



4th ed., Jena (Fischer), 1902, Svo, 771 pp. and 230 figs. 



Wright. A. E. — New Procedures for the Examination of the Blood and of 

 Bacterial Cultures. 



[(1) On the possibility of dispensing with the standard pipettes and micro- 

 metrical rulings of the hsemocytometer. (2) On a method of deter- 

 mining under the Microscope the number of micro-organisms contained 

 in bacterial cultures. (3) On a simple procedure for coagulation tubes 

 of standard calibre ; also a note on the practical importance of the 

 information obtained from the coagulometer.] 



Lancet, 1902, II. pp. 11-7. 



Metallography. 



Metallography : an Introduction to the Study of the Structure of 

 Metals chiefly by the Aid of the Microscope.* — This is the title of a 

 useful work by A. H. Hiorns. The author believes it to be the first on 

 the subject in the English language, and as the principles of metallo- 

 graphy are yet in their infancy, he has not attempted any strictly 

 logical basis of treatment. The book is divided into thirteen chapters, 

 the first three of which are devoted to methods of preparation ; the 

 others treat of the various metals and their alloys. The book is also 

 subdivided into sections, and the numerous photomicrographs amply 



* Macmillan & Co., 1902, 158 pp. and 96 photomicros. 



