ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



239 



more compartments would thereby be gained. The appliance described 

 possesses twenty compartments, but from experience I have found that 

 this number is sufficient. Could some transparent substance, such as 

 glass or mica, be used in its construction, so as to enable differentiation 

 to be carried out under the Microscope, it would be a great boon, but 

 all attempts to get this accomplished have so far failed. 



Dieterichs, K. — Mikroskopische Technik des Zentralnervensystems. 



[A review of general methods, of special methods of staining nerve-cells, 

 medullary sheaths, axis-cylinders, neuroglia, and nuclei.] 



Zeitschr. angew. Mikr., VIII. (1902) pp. 225-36. 

 Ehrlich, P., R. Kradse, M. Mosse, H. Rozin, & C. VV e i g e r t— Encyclo- 

 padie der mikroskopischen Technik mit besonderer Beriicksichtigung der 

 Farbelehre. Parts i. and ii., with numerous illustrations. 



Berlin and Vienna, 1903. 

 Grim me, A. — Die wichtigsten Methoden der Bakterienfarbung in ibrer Wirkung 

 auf die Membran, den Protoplasten nnd die Einschlusse der Bakterienzelle. 



Centralbl. Bakt., V Abt. Orig., XXXII. (1902) pp. 1-16, Sl-90, 



161-80, 241-55, 321-7 (2 pis.). 



(5) Mounting', including: Slides, Preservative Fluids, &c. 



Slide for Pond Life.* — S. E. Dowdy describes a convenient slide 

 for studying the life-histories of aquatic microscopic organisms and 

 pond life in general, similar in principle to Botterill's. It may be con- 

 structed as follows. Select a vulcanite cell-ring of small diameter and 

 medium thickness, and cut it in half. Cement the two portions with 

 gold size or coaguline in the centre of a 3 by 1 in. slide, so that a 

 narrow channel is left on each side of the circle (fig. 53). Pick out 







Fig. 53. 



a cell-ring of sufficient diameter to just encircle the other and rather 

 thicker than the first one. Cement this down round the other and 

 notch out the portions resting against the channels in the inner ring. 

 A thin circular cover-glass which will just fit into the larger cell-ring 

 completes the arrangement. 



Fresh water can be put in on one side with a pipette and any excess 

 drawn up at the opposite channel with a roll of blotting-paper. The 

 cover-glass can be lifted easily by inserting a needle under it through 

 one of the small openings. A slide of this description can be utilised 

 also in bacteriological work for studying hanging-drop cultivations, 

 excess of air, if necessary, being prevented by painting round the edges 

 of the cover-glass with vaseline. 



Engl. Mech., Isxvii. (1903) p. 13 (1 fig.). 



