1876.] - Seientifie News. 381 
two thousand molecules of liquid water or about five hundred and twenty 
of albumen lying end to end; and that in order to see the ultimate con- 
stitution of organic bodies, we should requre a magnifying power from 
five hundred to two thousand times greater than those we now possess. 
He calculates that with our highest powers we are as far from seeing 
the ultimate molecules of organic substances as we should be from see- 
. ing the contents of a newspaper with the naked eye at the distance of a 
third of a mile. A spherical particle one tenth the diameter of the 
smallest speck that could be already defined with our best and highest 
molecules. Mr. Sorby makes a very interesting application of his re- 
sults to Mr. Darwin’s theory of pangenesis, his general conclusion being 
that no serious objection can be raised against the theory when exam- 
ined from a purely physical point of view, as far as relates to the inheri- 
tance of a very complex variety of characters by the first generation. 
— A. W. BENNETT. 
Boston Microscoricat Sociery. — This society held a public re- 
ception at Fraternity Hall, on the evening of April 27th, for the pur- 
pose of making better known its organization and aims. A short exhi- 
bition with the oxy-hydrogen microscope was given, in addition to the 
use of more than fifty table microscopes, with their accessory apparatus. 
EXCHANGES. — [ Notices, not exceeding four lines in length, of micro- 
scopical objects or apparatus wanted or offered in exchange, not sale, 
will be inserted in this column without expense. | 
Arranged diatoms in exchange for good objects. Address offers to 
Christian Febiger, Wilmington, Del. 
Extract of hop, mounted, showing lupulin crystals; in exchange for 
any mounted objects. Address Richard Allen, 146 North Fourth Street, 
roy, N. Y, : 
SCIENTIFIC NEWS. 
_ — Physicians will be interested in a work entitled Micro-Photographs 
in Histology, Normal and Pathological, by Carl Seiler, in conjunction 
with J. Gibbons Hunt, M. D., and J. G. Richardson, M. D., to be pub- 
lished in twelve number by J. H. Coates, of Philadelphia. 
— Ata late meeting of the Paris Geographical Society, Dr. Haney 
stated that a cavern containing numerous Caraib remains had been dis- 
Covered at the western extremity of Cuba, and that these proved that the 
whole of the island was at one time inhabited by that race. 
— Professor Marsh publishes in the American Journal of Science, for 
June, a Notice of a New Suborder of Pterosauria. The group is distin- 
Suished by the want of teeth. 
a Mr. A. R. Marvine, a geologist of much promise, has recently died. 
l He was at the time of his death attached to Professor Hayden’s Survey. 
