ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 435 



The self-centering arrangement of the turntable is easily manipu- 

 lated. The jaws are compressed by springs, and bear gently against 

 the slide, so that, although it is firmly held, there is no danger of 

 mutilating its corners or breaking it. One-sixth of a revolution of 

 the milled ring is sufficient to open the jaws to their full extent, and 

 as this is easily done with one hand, the other is free to place the 

 slides. The hand-rest is detachable from the turntable. It has on 

 its lower surface an adjusting screw for varying the distance from the 

 revolving disk. 



For refinishing old slides, or others on which the object has not 

 been well centered, a detachable pair of spring clips are provided. 

 Concentric circles up to one inch diameter are turned on the 

 disk. 



Crystallised Fruit Salt.* — Mr. G. J. Wightman says that Eno's 

 fruit salt, when crystallised, makes a magnificent polariscope object. 

 The mode of prejiaration is as follows : In a small test tube, say 

 3 X f inches, dissolve as much of the salt as would rest on a six- 

 pence, by adding distilled water to the depth of an inch. With the 

 end of a glass rod spread a few drops over an ordinary glass slip, 

 and in a few minutes crystallisation will take place. The slide (with 

 selenite) will be seen to be covered with numerous beautiful forma- 

 tions, each somewhat resembling a Maltese cross made up of bril- 

 liantly-coloured needle-like crystals. If it is held over the flame of 

 a lamp as soon as the solution is placed on (so as to hasten crystallisa- 

 tion), the colours will be the more splendid without selenite. Other 

 beautiful effects may be produced by the addition of a few drops of 

 alcohol to the test tube. The slides, as soon as dry, may be mounted 

 in Canada balsam. 



Allen, F. J. — Cleaning Gizzards. 



[Feed the insects on honey, syrup, or treacle, before killing them.] 



Journ. Post. Micr. Soc, I. (1882) pp. 48-9. 

 Abnold, J. W. S. — Microscopical Laboratories. 



[Comments, &c., on the previous articles on the same subject — also as to 

 the superiority of small instruments.] 



Amer. Mm. Micr. Journ., III. (1882) pp. 69-70, 75. 

 Basevi, Col. — Mounting Starches. 



[Not in balsam, but dry or in glycerine jelly, and viewed as opaque 

 objects.] 



Journ. Post. Micr. Soc, I. (1882) pp. 49-50, 

 BiRGE, E. A. — On a Convenient Method of Imbedding. 

 [Supra, p. 428.] 



Amer. Mon. Micr. Journ., III. (1882) pp. 73-5. 

 Blood Stains on Steel. 



[Dr. M. C. White recognized and measured by means of the vertical 

 illuminator and ^-inch objective, blood-corpuscles upon a steel instru- 

 ment that had been exposed during two winters in the woods.] 



Amer. Natural., XVI. (1882) p. 347. 

 Bowman, F. H. — See Cotton infra. 



Chalon, Listes de preparations histologiques et botaniques de M. (List of 

 histological and botanical preparations of M. Chalon.) 



BuU. Soc. Belg. Micr., VII. (1882) pp. liv.-vii. 



Sci.-Gossip, 1882, p. 64. 



