620 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



This was followed by 1 • 5 p.c. silver nitrate solution for 6-12 days, with 

 subsequent reduction with hydroquinone. In some cases the reduction 

 was hastened with soda and sodium sulphite. The 40 p.c. spirit pre- 

 parations retained the colour best, and it was afterwards found advisable 

 to use 3 p.c. silver nitrate, as 1 • 5 p.c. was not strong enough. The 

 paraffin sections were after stained with thiazin-red. 



Moist Chamber for Studying the Thrombocytes of Salamanders' 

 Blood.* — F. Meves, when studying the thrombocytes of salamanders' 

 blood and their relation to coagulation, used the following apparatus 

 (fig. 72). The moist chamber, made of tin, was 14 cm. long, 1\ cm. 

 broad, and 5 J cm. high, and to one of the two long sides was soldered a 

 thick metal plate. Halfway up, this side was traversed by a slit 8| cm. 



Fig. 72. 



long and about 4 mm. thick. Into this slit fits a metal piece which 

 carries a circular tray. The metal piece and the disk were able to revolve 

 round a vertical axis passing through their centre. The chamber, which is 

 open at the top, was filled to a depth of 1 cm. with ■ 8 p.c.salt solution, 

 and then covered with a glass plate made air-tight by means of vaselin. 

 The slides, covered with a fresh film of blood, were placed on the outer 

 half of the tray, and then, by giving it a turn through 180°, were quickly 

 brought into the moist atmosphere. 



As fixatives, 1 p.c. sublimate or Flemming's mixture (weak formula), 

 both with 1 p.c. salt added, were employed. The sublimate-fixed pre- 

 parations were stained with the Ehrlich-Biondi solution, while Flemming 

 preparations were treated with safranin and Delafield's hsematoxylin, or 

 with Flemming's triple stain. 



Studying Polysiphonia violacea.f — S. Yamanouchi fixed his 

 material in Flemming's fluid, Hermann's fluid, and 1 p.c. picric acid. 

 He found that chrom-acetic acid (1 p.c. chromic acid, 25 c.cm. ; 1 p.c. 

 glacial acetic acid, 10 c.cm. ; sea-water, 65 c.cm.) was best suited for 



* Archiv. Mikrosk. Anat., lxviii. (1906) pp. 311-58 (4 pis.). 

 t Bot. Gazette, xli. (1906) pp. 425-33. 



