1887.) . MICROSCOPICAL JOURNAL. 33 
out with distilled water. If desired, the epithelium of the mesentery may be 
silvered after the injection. 
8. White fluid.—The salt of sulphate of baryta is reprecipitated from a 
cold saturated solution of 4 ounces of chloride of barium by adding, drop- 
wise, sulphuric acid. After standing in a tall cylindrical vessel for 12-24 
hours decant one-half the supernatant fluid and combine the remainder, well 
shaken, with a mixture of one ounce each of water and glycerin. This is 
distinguished for great permeability, and is good for lymph passages or 
glandular canals. It may be kept for months without alteration, and is ready 
for instant use. 
g. Seiler’s carmine gelatin.—(a) Best carmine 2 drs., dist. water 3 
oz., strong ammonia water 20 drops. Dissolve this and filter, covering fun- 
nel with glass plate to prevent evaporation of ammonia. (6) Cox’s gelatin 
2 drs., dist. water 2 0z. Soak the gelatin until soft, then dissolve it in the 
water bath and strain through a fine flannel while hot. Heat the gelatin 
solution again and add the carmine solution; heat roo° F., and add dilute 
acetic acid (10% ?), drop by drop, with constant stirring, till the ammonia 
is neutralized, or until the solution changes from a lilac to a scarlet color. 
EDITORIAL. 
MATERIAL MOUNTED AND UNMOUNTED.—We shall do a favor to our readers 
and to microscopy by information of an offer of slides from Miss M. A. Booth, 
of Longmeadow, Mass., made known to us through correspondence with her. 
Miss Booth’s work is already well known to a great many microscopists. 
While not one of those who seem to find the sole merit of a preparation in 
the perfection of the work done with the illuminated label and turn-table, she 
does pay the most scrupulous heed to those minor details, and her slides, from 
that stand-point, are irreproachable. But the chief merit of the slides offered 
consists, not in the mounting, but the objects. These are not ordinary speci- 
mens, such as any one can pick up from any pool, but are both varied and 
rare. Her partial list embraces a great variety of marine alge, authentically 
named, named diatoms zz szfw or not zz sztu, diatomaceous earths from 
America and Europe, fern spores and sporangia, mosses, plant hairs, animal 
hairs, fish-scales, etc., etc. We have seen a great many of her slides, and 
feel no hesitation in recommending them to any collectors who may wish to 
purchase. 
O 
West AMERICAN SCIENTIST.— We are glad to congratulate the West 
American Sctentist upon its greatly improved appearance and the marked 
and rapid growth in interest in its contents. The Society which it repre- 
sents at San Diego is active in scientific work, and the results of its research 
is shown by the definition in the December number of a new genus of grass 
by Dr. Vasey, Orcuttéa californica, and a new lamellibranch fossil, allied 
to the oyster, named by Dr. C. A. White, Corallichama orcuttz?. 
sh 
POSTAL MICROSCOPICAL CLUBS.—Mr. J. W. Measures, in his presidential 
address on newly assuming office in the Postal Microscopical Club of Great 
Britain, adverts to facts which we would most heartily present to our readers. 
Speaking of the Society, he shows that it exists for the benefit of those who, 
while anxious to use the microscope, are discouraged by isolation. In no de- 
partment of work is this felt more than in the mounting of objects. The be- 
ginner is unable to learn from the books on the microscope all the minutiz 
of so fine an art as mounting. On the other hand, how different with the 
beginner in our large towns, where he may attend the meetings of a micro- 
