1896.] MICHOSCOPICAL JOURNAL. 249 



Practical Photomicrography, a Correction. — W. C. Bor- 

 den asks us to correct an error which appeared in his article 

 "Practical Photomicrog-raphy'' published in the Journal 

 for June, 1896. The description of fig-. 4, pag-e 199, and 

 fig. 7, page 205, should be transposed. Fig-. 4 is a pho- 

 tomicrograph of Typhoid bacillus x 1000 diameters and 

 fig-. 7, one of a colony of Staphylococcus pyogenes aurens x 

 30 diameters. Also under Fig-. 3 it should be stated that 

 the g-onococci and cell nuclei are distinct, not indistinct. 



MICROSCOPICAL MANIPULATION. 



For Clearing Vegetable Sections. — We have found 

 purified oil of turpentine far superior to clove oil as a 

 cleanser of veg-etable sections. In looking- over a lot of 

 several hundred old slides recently, the superior beauty of 

 those prepared with turpentine oil was apparent at a 

 glance. — Nat. Druggist. 



Good Liquid Cement. — The following-' is said to make 

 an excellent liquid cement : — To a solution of chloral hyd- 

 rate in water dissolve g-elatine to the required consistency. 

 The cement thus made is said to have great adhesiveness 

 and to remain indefinitely unchang-ed. Ordinary g-lue may 

 be used instead of the more expensive g-elatine; it is 

 equally strong-. 



Mounting Specimens. — While using Dr. Dudg-eon's 

 pocket Sphygmog-raph, I was g-reatly struck by the 

 g-ood backg-round produced by holding- enamelled paper 

 over the flame of burning camphor until it became coated 

 with soot. 



The tracing-s of the needle were also very white and well 

 defined. This led me to think that it mig^ht be applicable 

 for opaque mounting, and peculiarly suited for mounting- 

 many species in numbered spaces on our slide. I tried it 

 and found it to work very well. The following- is the pro- 

 cess I have found most successful : — The paper is first 

 g-ummed to a slip of thin card, and after it is dry held over 



