118 SUMMARY OF CURRENT RESEARCHES: . 



When required for staining, the solution is prepared by mixing: 

 together 4 ccm. of the eosin solution, 1 ccm. of the Borrel's blue solu- 

 tion, and 6 ccm. of distilled water. The slide with the fixed film is 

 immersed in the foregoing for 20-30 minutes. After removal, it is 

 washed freely with water, and then treated with the tannin solution for 

 10-15 minutes. It is then washed again with tap and afterwards with 

 distilled water, and then dried. 



If there be a precipitate on the film this may be removed with oil of 

 cloves followed by xylol, and the surface wiped with a cloth dipped in 

 xylol. 



In default of the foregoing stain, Eomanowsky's method may be 

 adopted or the preparation may be stained with alcoholic solution of 

 fuchsin or with carbolate of thionin. 



Gage's ' The Microscope.' *— The eighth edition of Prof. S. H. Gage's 

 well-known and much appreciated work on the Microscope, an intro- 

 duction to microscopic methods and to histology, has recently appeared. 

 For the present issue the work has been revised and enlarged, and though 

 preserving the same general features as its predecessors contains new 

 matter of°some importance. In re-writing this edition the author has 

 re-cast the work and has added new figures as well as textual matter. 

 Chapters on Class Demonstrations in Histology and Embryology and on 

 the Projection Microscope are not only extremely valuable in themselves 

 but also indicate one of the paths along which microscopical science is 

 advancing, and the pioneering efforts of the author to keep his work 

 abreast of the knowledge of the time. 



Micro-chemical Reactions of Wood affected with Dry Rot.f — 

 G. Marpmann mentions that wood affected with dry rot gives the follow- 

 ing micro-chemical reactions :— (1) Iodol + dilute HC1 or H 2 S0 4 turns 

 the diseased parts yellow, or brownish-yellow, healthy wood staining a 

 carmine red. (2) Chlor-zinc-iodin or iodine + H 2 S0 4 turns the at- 

 tacked places blue in about £ hour, the healthy wood remaining yellow. 

 (3) Nessler's reagent imparts a dark brown hue to the diseased parts, 

 the apparently healthy portions being yellowish-grey or grey. 



* Comstock Publishing Company, Ithaca, New York, 1901, viii. and 299 pp. and 

 230 figs. t Centralbl. Bakt., 1* Abt., xxx. (1901) pp. 775-82. 



