1877. ] Scientific News. 573 
rial; or selected shells from the same, for mougtings of special interest. 
Address C. C. Merriman, Rochester, N. Y. 
Insects’ eggs; also American podura. Whole insects or scales. 
Address George W. Frees, Friendship, N. Y. 
Alge from California and Japan, on which are fine’circular diatoms. 
Address W. C. J. Hall, Jamestown, N. Y 
Scales of hunting spider, Salticus senicus. Address William Readio, 
Garnerville, Rockland County, N. Y. 
Oölitic sand from Salt Lake. Address F. H. Atwood, 160 Lasalle 
Street, Chicago, Ill. 
Lupulin crystals in extract of hops. Address Richard Allen, 146 
North Fourth Street, Troy, N. 
Diatoms from Keene, N. H. Address Edwin S. Gregory, Youngs- 
town, Ohio. 
Diatoms from Lake Superior; dredgings eight teet deep near the 
head of Portage Lake. Address Dr. T. U. Flanner, Springfield, Mo. 
A variety of mounted objects for exchange. Address offers to Fred- 
erick A. Eddy, 89 State Street, Bangor, Me. 
SCIENTIFIC NEWS. 
— Dr. Joseph D. Hooker, keeper of the Kew Botanical Gardens, 
England, and Professor Asa Gray, of Cambridge, are both temporarily 
attached to the U. S. Geological and Geographical Survey of the Terri- 
tories, Dr. F. V. Hayden, U. S. Geologist, in charge. In company with 
Dr. Hayden they have visited various portions of Colorado, making the 
ascent of Gray’s Peak, and exploring the interesting flora of the mount- 
ains and parks, as well as that of the foot-hills and adjacent plains. 
Previous to August lst, these eminent botanists had collected nearly 
four hundred species of rare plants, being thus enabled to study critically 
in their native habitats the species they had during past years described 
from dried specimens brought in by expeditions. Both of these gentle- 
men will prepare reports on the botany of the West for the Eleventh An- 
nual Report of Hayden’s Survey. A preliminary report by Dr. Hooker 
is already well advanced. After a sojourn of several weeks in Colorado 
and Utah, they left Salt Lake City, August 11th, for the Pacific Coast. 
— The Summer School of Biology at the Peabody Academy of Sci- 
ence, Salem, Mass., opened July 7th with twenty-one laboratory stu- 
dents, while a few others attend the daily lectures. This is a larger 
number than were present last year. Lectures have been given by Mr. 
J. H. Emerton, Rev. E. C. Bolles, Mr. John Robinson, Professor J. 
Ramsay Wright, of Toronto, Rev. T. C. Hervey, Mr. C. S. Minot, and 
Dr. Packard. Material for dissection from Woods Holl, Mass., has 
been contributed by Professor Baird, U. S. Commissioner of Fish and 
Fisheries. 
