1885.] Scientific News. 333 
3. Acetic acid slowly added until the cherry-red color becomes 
brick-red. The addition of acetic acid. should be accompanied 
with stirring, and should cease the moment the change in color 
is effected. 
4. Filter until no trace of a precipitate remains. 
If the color is not sufficiently deep, a few drops of ammonia 
should be added before filtering, and the solution left in an open 
vessel until the alkali has volatilized. 
Objects may be left for twenty-four hours or more in this fluid. 
The deep stain should be partially removed by immersion in a mix- 
ture of water (fifty vols.), glycerine (fifty vols.), and muriatic acid 
(a half vol.), for a few minutes. The karyokinetic figures are 
thus brought out with great distinctness. 
SCIENTIFIC NEWS. 
— The Entomologische Nachrichten, founded by Dr. Katter 
at Putbus, is now edited by Dr. F. Karsch, and published by 
R. Friedlander & Sohn in Berlin. It is apparently improved, and 
No. 1 for this year is illustrated by a plate, with two wood-cuts. 
Dr. Ernest writes to it from Caracas, “ we have here the locust 
plague! Acridium peregrinum in immense swarms. The eggs 
are infested by a small hymenopter, Scelio famelicus Say,” noticed 
in the second report United States Entomological Commission, 
270. 
—A first duplicate of the “ Philip Carpenter collection” of shells, 
reserved by the late Dr. Carpenter for private use and study, re- 
mains in possession of his widow, Mrs. Carpenter, 241 Univer- 
sity street, Montreal. It contains, according to a catalogue accom- 
panying it, 4039 species. There is also one of the best duplicates 
of the “ Mazatlan collection” of Dr. Carpenter. These collec- 
tions will be disposed of on reasonable terms, more especially 
to any public collection or working naturalist. 
—WNature Nov. 20th, 1884, p. 72, contains a report of the 
‘Academy of Sciences, Paris, on the depth to which sunlight pen- 
etrates the waters of Lake Geneva, by MM. H. Fol and Ed. 
Tarasin. From a series of experiments carried out in August 
and September of that year, the author concludes that light 
reaches a depth of 170 meters, and probably a little more, the lu- 
ninosity at this point being about equal to a clear moonless night. 
— The first part of a detailed and well illustrated work on the 
embryology of Peripatus, by Dr. J. Kennel, appears in the Arbei- 
ten aus dem Zoologisch-Zodtomischen Institute in Wü ; 
Bd. vır, Heft 2. The six folding plates are packed with illustra- 
tions which show, without undervaluing the labors of Balfour, that 
this memoir will be the fullest and most important yet published 
in the development of this exceedingly curious creature. i 
—Mr. A. Agassiz, the director of the Museum of Comparative 
Zodlogy, has distributed to correspondents in this country M. 
