410 . Scientific News, [April, 
picric acid; then leave in moist chamber for a few hours (hæma- 
toxylin), or one or more days (alum carmine). 
(6) Wash with distilled water, proceeding as in No. 4. 
7) Dehydrate with absolute alcohol, taking care not to disturb 
the cover, and then add a border of clove oil. The alcohol soon 
- evaporates and is replaced with the clarifying medium. The 
preparation is now ready for examination. If the preparation is 
to be preserved permanently the clove oil should be replaced by 
xylol, and then a thin solution of balsam in xylol allowed to flow 
under the cover as the xylol evaporates. Asa good preparation 
is often spoiled in the process of mounting, it is well to make the 
examination in clove oil first. 
i 10: 
SCIENTIFIC NEWS. 
— Dr.C. V. Riley, entomologist of the Department of Agricul- 
ture and honorary curator of insects in the National Museum, has 
presented to the National Museum his extensive private collec- 
tion of North American insects, representing the fruits of his 
labors in collecting and study for over twenty-five years. His col- 
lection contains over 20,000 species, represented by over 115,000 
pinned specimens, and much additional material preserved in 
alcohol or other methods. It is estimated by those familiar with 
the collection to have a money value of at least $25,000. In addi- 
tion to the actual cost of material it is hard to estimate the amount 
of time and labor that such a collection represents, In acknowl- 
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re rich in Coleoptera and Lepidoptera, and the latter contains many 
-rai , blown and in alcohol. As it stands, by this gift the 
- entomological collections of the National Museum become ne 
ye 
and ultimate function of the nucleus, as found in what may be 
ae chiefly. made on the living organism. The object-glasses em- 
ployed by Dr. Dallinger are high powers of most recent construc” 
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tion, in which the apertures have been carried to highest 
= -assumed to be its simplest condition in the more striking of the 
-~ Septic organisms, and his microscopical observations have been — 
