312 Scientific News. [May, 
as to bring different parts of its median line successively to the centre of 
the apparatus, and thus a series of cells may be made upon the same 
slide, or any desired group of cells may be made by using a variety of 
unequal triangles. For common use the two triangles should be exactly 
alike, should be right-angled, and should have the sides adjoining the 
right angle one inch in length. Such pieces may be cut from sheet brass 
about the thickness of anordinary glass object slide. These triangles 
may also be used, with the addition of a few cardboard blocks, for the 
purpose of decentring, in refinishing old slides that have not been ac- 
curately centred. 
SCIENTIFIC NEWS. 
— In the Seventh Annual Report of the American Museum of Natu- 
ral History it is stated that the trustees have purchased Professor Hall’s 
paleontological collection for $65,000, and Mr. Squier’s rare collection 
of antiquities from South and Central America-; $200,000 have been 
appropriated by the New York legislature for furnishing the magnificent 
new museum building on Manhattan Square. The number of visitors to 
the museum, still remaining in the old arsenal, averages 13,577 a week, 
the weekly average of visitors to the entire British Museum, embracing 
all the exhibition halls, being 11,574 in 1874. 
— The Bulletin of the United States Geological and Geographical Sur- 
vey of the Territories, vol. ii. No. 1, contains A Notice of the Ancient 
Remains of Southwestern Colorado, examined during the Summer of 
1875, by W. H. Holmes; A Notice of the Ancient Ruins in Arizona 
and Utah lying about the Rio San Juan, by W. H. Jackson ; The Hu- 
man Remains found near the Ancient Ruins of Southwestern Colorado 
and New Mexico, by Dr. Emil Bessels. 
— Mr. Grote’s Check-List of the Owlet Moths or Noctuide of Atao: 
ica, Part I, Bombyciæ and Noctuelite (Buffalo, N. Y., pp- 28), ag 
very useful catalogue. It is accompanied by a photograph illustrating 
several new species, : 
— From The Round Table and Beloit Monthly we learn that a bill 
has been passed by the legislature of Wisconsin appropriating $25,000 
for printing the geological reports made during the past three years by 
he late Dr. Lapham and others, as well as those that shall be prepar ed 
by Professor Chamberlain, who has been appointed to complete the work. 
The New York Nation states that $10,000 has been appropriated by 8 
same legislature for the purchase for the university of Dr. Lap T 
collections and library. - It also is to print for the Wisconsin Academy 
of Sciences a volume of transactions in alternate years. 3 
— Professor Angelin, a Swedish geologist and palæontologist, disa 
Stockholm on the 13th of February, aged seventy. ' 
— Prof. F. V. Hayden has been elected a member of the Imperial 
Society of Naturalists of Moscow. ; 
