ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
577 
or weak alcohol, Mayer sometimes used tlie staining fluid itself, which 
acted with unusual rapidity and intensity when the sections were brought 
for stretching purposes into warmth. Finally the general theory of 
mucus staining is discussed. 
Serum-Injection Syringe.* — Dr. Gabritschewsky has devised a 
syringe for injecting diphtheria-serum, and one of its chief advantages 
is that it can be directly applied to the bottles containing the serum. 
Its construction is easily understood from the illustration : a is a metal 
Fig. 92. 
tube passing through a rubber plug 6, and c a rubber tube connecting 
with the needle. After these parts have been disinfected in boiling 
water, the plug is inserted into the serum bottle, and the rubber ball d 
put on. The syringe is then ready for injecting. Entrance of air 
under the skin is easily prevented by pinching the rubber tube as soon 
as the last drops of serum are emptied from the bottle. 
(5) Mounting-, including- Slides, Preservative Fluids, &c. 
Use of Formalin in Neurology.t— Dr. P. A. Fish reviews the 
various means which have been recommended for preserving nerve pre- 
* Centralbl. f. Bakteriol. u. Parasitenk., l te Abt., xix. (1896) pp. 551-2 (1 fig.), 
t Proc. Amer. Micr. Soc., xvii. (1895) pp. 319-39. 
