ZOOLOGY AND 150TANY, MICROSCOPY, ETC. 



777 



with Mallory's hematoxylin phospho-tungstic acid solution for 12 to 24 

 hours. Then, after treatment for an hour with alcoholic ferric chloride, 

 the slide is washed with distilled water, and soaked in absolute alcohol 

 in order to remove the last traces of iron. The differentiating effects of 

 ferric chloride can lie controlled by microscopic examination, the reagent 



za 



Fig. 114. 



being washed off when the process has gone far enough. After 24 hours 

 in absolute alcohol, the sections may be cleared and mounted. The glia 

 fibres are stained deep blue, axis cylinders greyish yellow, elastin yellowish 

 brown, glia protoplasm light blue, and erythrocytes a dirty yellowish grey. 



(3) Cutting-, including- Imbedding- and Microtomes. 



Theory and Practice of Sharpening Razors.* — C. Funck considers 

 in some detail the conditions of razor edges, their imperfections and the 



* Zeitschr. Wiss. Mikrosk., xxvii. (1910) pp. 75-91. 

 Dec. 21 st, 1910 3 f 



