376 SUMMAEY OF CURRENT RESEARCHES RELATING TO 



In order to fix the pigment granules in situ the whole eye should be 

 immersed for about eight hours in the following solution. Saturated 

 solution of sublimate in 1 p.c. sodium chloride, 2 c.cm. ; 1 p.c. solution 

 of osmic acid, 2 c.cm. ; 1 p.c. acetic acid, 1 c.cm. The eye is then 

 transferred to Midler's fluid for 16 hours, after which the cornea is 

 excised and washed in running water for 1 or 2 days. The material 

 may then be dehydrated in absolute alcohol, and, having been cleared 

 in origanum oil, examined on the flat, or sections may be made by the 

 paraffin or celloidin methods. 



Triple Staining of Vegetable Tissue.* — L. Petit stains sections 

 of vegetable tissue with iron chloride and ferrocyanide of potash, 

 whereby the cellulose and collenchyme are coloured blue. The cork 

 and cuticula are stained with alkanna and woody tissue by means of an 

 aqueous or alcoholic solution of iodine green. In this way a triple stain- 

 ing is obtained. 



Vital Staining of Corethra plumicornis.t — W. Kolmer, after trying 

 to stain the larvae of Corethra plumicornis with methylen-blue but with- 

 out success, hit on the following ingenious device. In the fluid con- 

 taining the larvae and the methylen-blue he placed a colony of Stentor 

 cceruleus. The infusoria soon perished, and methylen-blue granules were 

 freely deposited on their bodies. These were greedily eaten by the larva?, 

 the stain passing from the alimentary canal to other parts of their 

 anatomy, so that the structure of the animals was easily observed. 



New form of Section-Lifter 4 — S. E. Dowdy bends a piece of wire 

 gauze to the shape of a funnel. A circular cover-glass is placed inside 

 the hopper. After the funnel is immersed in the fluid the section is 

 washed off into it. On raising the funnel, the section is left stranded on 

 the cover-glass. The latter is then easily removed. By this procedure 

 thin and delicate sections may be secured and mounted without risk of 

 injury. 



Dowdy, S. E. — Thickness of cover-glasses. 



English Mechanic, Ixxix. (1904) p. 81. 



„ Ditto. Tom. cit., p. 123. 



F.R.M.S.— Ditto. Tom. cit., p. 104. 



G ribbon, W.— Ditto. Tom. cit., p. 194. 



Holmes, Edwin— Ditto. Tom. cit, p. 104. 



Mietek, Millie— Ditto. Tom. cit., p. 123. 



Treadle— Ditto. Tom. tit., p. 240. 



Verinder, A. — Mechanical finger. 



English Mechanic, Ixxix. (1904) pp. 88, 153 (1 fig.). 

 (See this Journal, 1879, pp. 951-3.) 



Villagio — Modern Mounting Methods— continued. 



English Mechanic, lxxix. (1904) pp. 13, 83, 149, 240; 



lxxviii. (1904) p. 534. 



* Proc. Soc. Amis Sci. Nat. de Rouen, 1903. 



t Biol. Centralbl., xxiv. (1904) pp. 221-3. 



J Pharmaceut. Journ., lxxii. (1904) p. 263 (1 fig.). 



