688 
SUMMARY OF CURRENT RESEARCHES. 
mould is then strengthened by a backing of plaster of Paris, and having 
been divided up into sections in the usual way by means of threads, is 
removed. 
Though the procedure is somewhat cumbersome, the results are extra- 
ordinarily good. 
Lee and Mayer’s Outlines of Microscopical Technique for Zoologists 
and Anatomists.* — The general scope of Mr. N. Bolles Lee’s work on 
microscopical technique is too well known to English microbiologists 
to require any description. 
Herr P. Mayer, of Naples, has recently brought out a German edi- 
tion which, while purporting to be a translation, is really a revision. 
The work has been much improved by the alteration and the care be- 
stowed on it. 
Cement for Glass.j — The following mixture is recommended for 
cementing glass used in aquaria. Gum elastic is dissolved in benzin 
till the fluid has a syrupy consistence. White lead and linseed oil 
varnish are rubbed up to a paste and mixed with the gum solution. The 
cement may also be used for sticking glass to wood. 
Bone-Corrosion Preparations.^ — Hr. Stanislaus von Stein describes 
a new method of obtaining models in caoutchouc of the inner ear. The 
first necessity is that the temporal bone should be thoroughly cleaned ; 
to effect this it may be injected with hot concentrated soda solution. 
When clean it is to be injected with “ Kosa-Kautschuk ” dissolved in 
chloroform, and placed for twenty-four hours in a beaker filled with 
solution which is allowed to slowly thicken. The bone is then reinjected 
if necessary, allowed to dry completely, and the caoutchouc scraped from 
the surface except over the openings. The next process is that of vul- 
canisation, accomplished by placing the bone in a cuvette in a thin 
plaster of calcium sulphate, closing the cuvette tightly, and placing it 
for an hour and a half in a vulcanising apparatus. It is then taken out 
of the cuvette, the adherent sulphate removed in water, and the pre- 
paration decalcified by being placed in a solution containing hydrochloric 
acid in the proportion of 1 to 5. The perfectly hard preparation is then 
washed, dried, and varnished. The advantages of the method are claimed 
to be its rapidity and cheapness, and the permanence and excellence of 
the result. 
As a Frontispiece to the current volume, we give a reproduction 
of an excellent photograph, taken by Mr. Washington Teasdale, which 
may interest our older Fellows, of the room in King’s College, where the 
meetings of the Society were held from the year 1S67 until we moved to 
the present roou s in Hanover Square in 1890. 
* Berlin, 1898 (Friedlander u. Sohn). See Bot. Ztg., Ivi. (1898) 2 te Abth., 
pp. 185-6. f Zeitsclir. f. angew. Mikr., iv. (1898) p. 109. 
X Anat. Anzeig , xv. (1S98) pp. 112-6. 
