ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



ii.; 



This stand is placed on the body of the animal whose blood the insect 

 in the tube C is required to suck ■ the disk in the tube is removed, and 

 the diaphragm of D is opened, and the insect is thus brought in contact 

 with the skin. When suction has taken place the diaphragm is slowly 

 closed, whereby the insect is drawn back again into the tube ; the 

 apparatus is now removed and inverted, so as to allow the insect to fall 

 to the bottom of the tube C, which is then closed again by the metal 

 disk, and removed from the stand. In this way a number of insects 

 may he successively used and preserved for further observation of 

 experiment. * 



Small Bacterial Grinder.*— B.White describes a small mill (fig. 19) for 

 grinding dried bacterial cultures. It consists of a thick glass flask with 

 a ground stopper, holding 20-30 smooth agate marbles, about 1'5 cm. 



tsm* 



Pig. 19. 



diameter. The flask is fixed to a metal holder, fitted with an axis, 

 which by a simple mechanism can be slowly rotated. The apparatus is 

 readily sterilised, and very fine state of powder can be obtained. 



After ten hours a dried culture of Bacillus typhosus exhibited no 

 bacillary bodies. 



Methods of Textile Chemistry. | — This work, by F. Dannerth, 

 though it does not directly appeal to the microscopist, will be found very 

 useful by anyone interested in textile fabrics, owing to a very excellent 

 glossary of trade terms. 



* Centralbl. Bakt., lto Abt. Orig., xlviii. (1908) p. 254. 



t New York : John Wiley and Sons ; London : Chapman and Hall, 1908, viii. 

 and 164 pp. 



Feb. 17th, 1909 I 



