ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 263 



of an ordinary room up to the melting-point. A set of plates illustrates 

 the results obtained. These give a series of views of a single specimen 

 of crushed lead taken at intervals during six months, showing the growth 

 of crystals at the air-temperature, seen under oblique light and magnified 

 12 diameters. The metal was scored in unsymmetrical shapes, so as to 

 facilitate identification of the same crystals. Great pains were taken 

 to secure a constant direction of the oblique light. The metal was 

 always prepared by etching a piece of ordinary plumbers' lead by dilute 

 nitric acid, and by viewing when wet. The large size of the crystals 

 rendered low powers and oblique light very suitable. 



■Gage, Simon H. — The Microscope. 



[Includes for the first time the microscopical examination of photomicro- 

 graphy of metallic surfaces.] 



8th ed., Comstock Publishing Co., Ithaca. New York. 

 Henocque, A. — La spectroscopic et la niicroscopie en anatoime generale. 



Comptes Rend. 13 Congr. tnternat. de Med. Sect. 

 d'Hist. et d'Embryol, Paris, 1900, p. 145. 

 Hows, H. M. — Metallurgical Laboratory Notes. 

 [Gives much attention to metallography.] 



Published by Boston Testing Laboratories. 



Koenigsberger, J. — Zur optischen Bestimmung der Erze. (On the Optical 



Determination of Ores.) Centralbl. f. Mineral., 1901, No. 7, p. 195. 



L angle y, J. N. — Practical Histology. London (Macmillan), 1901, 8vo, 340 pp. 



Malcolm, J. — Influence of Stain Solvent on Protoplasmic Staining. 



Proc. Scot. Micr. Soc, III. (1900-1) pp. 76-8. 

 Masohke, O. — Mikroskopische Studien iiber die Krystallisation des Gypses. 

 (Microscopical Studies on the Crystallisation of Gypsum.) 



Zeit. f. Erystallogr., XXXIII. (1900) p. 57. 

 Mil ROY, T. H. — Protoplasmic Staining. 



Proc. Scot. Micr. Soc, III. (1900-1) pp. 73-5. 

 Richter, O. — Mikrochemische Nachweis des Kobalts als Ammonium-Kobalto- 

 phosphat. (Microcliemical Determination of Cobalt as Ammonium cobaltophos- 

 phate.) Tschermalc's Mineral, u. Petrog. Mittheil., XX. (1901) pp. 99-109. 



Schmorl, G. — Die pathologisch-histologischen Untersuchungsmethoden. (Patho- 

 logical and Histological Investigation Methods.) 



2nd ed., Leipzig (Vogel), 1901, 8vo, 263 pp. 

 Smith, Sydney, W. — The Microstructure of Metals and Alloys. 



[A useful practical paper, mainly dealing with general methods.] 



Journ. Quek. Micr. Club, Nov. 1901, pp. 125-30 (1 pi. of 6 figs.). 

 Strehl, K. — TJeber Achromasie. 



[Explains the formulae : specially with reference to telescopes.] 



Central-Zeit. f. Opt. u. Mech., XXIII. (Feb. 1902) p. 21. 

 Tedeschi, A., & A. Bosselli — A Self-regulating Electric Thermostat. 



Centralbl. Bakt, 1" Abt., XXX. (1901) pp. 969-76 (5 figs.). 

 Williams, J. Leon — Use and Value of the Microscope in Dentistry. 



Journ. Brit. Dental Ass., XXIII. (1902) pp. 1-19 (13 figs.). 



