84 Scientific News. . [ January, 
of their new enterprise. Besides the very simple and excellent 
Acme microscopes and the accessories belonging to them, much 
information is given in regard to microscopical supplies in general. 
Tue SPENCER Opjectives.—The partnership heretofore existing © 
between C. A. Spencer & Sons, has been dissolved, and Herbert 
R. Spencer announces that he will hereafter furnish lenses marked 
H. R. Spencer & Co., made after the same formulas, and of the 
same uniform excellence, which have for years past characterized 
the lenses made under his supervision, by the old company. 
Gutta PercHa Cetits.—These rings for mounting dry objects, 
can be obtained from Lloyd H. Smith, of Geneva, N. Y., at from 
fifty to eighty cents per hundred. They are such as are used by 
Prof. H. L. Smith, and are suitable for diatoms and other thin 
objects. 
SCIENTIFIC NEWS. 
- — The U. S. Entomological Commission designs preparing for 
publication, probably in the appendix of its third report, a bibli- 
ography of American (and Canadian) economic entomology. 
The bibliography will contain references to papers, articles and 
notes in agricultural and popular scientific periodicals, as well as 
journals devoted to bee culture, and as complete as possible ref- 
erences will be made to entomological notes in those periodicals 
which appeared prior to 1850. The titles of notes, articles, re- 
ports on works, will be entered under the name of authors, or of 
periodicals, especially agricultural reports and papers, with brief 
digest of contents given in a line or two, in the same style as in 
Mr. Mann’s excellent bibliographical record of Psyche, the organ 
of the Cambridge Entomological Club, of Cambridge, Mass. 
After due pains are taken sucha record will necessarily be quite 
imperfect. The compiler will have to rely much on aid from au- 
thors of any and every article or note on economic entomology. 
Its completeness will greatly depend on the care with which en- 
tomologists may prepare lists of their own articles. Entomolo- 
gists are therefore earnestly requested to cooperate by sending 
full lists of their papers or notes on any subject connected with 
economic entomology (not general or scientific entomology unless 
bearing on the applied science) and prepared in the style of that of — : 
Psyche, to A. S. Packard, Jr., at Providence, R. I. 
— Jacob Boll, of Dallas, Texas, died recently in Western 
Texas ata distance from civilization. He was a native of the 
Canton of Aargau, Switzerland, and was a pupil of Agassiz 
before the latter came to the United States. He was active in 
promoting educational reform in his native country, and was an 
authority in entomology. During a long residence in Texas he 
was an untiring collector, and sent many specimens to Europe- — 
His collections. of insects, especially of Lepidoptera, are une- 
