CONTENTS. 
X. Some account of Irnret Town’s improvement in the 7 
construction and practical execution of es for 
Roads, Railroads, and Aqueducts, - 
XI. Description of an Economical Apparatus fat Solidity- 
ing Carbonic Acid, recently constructed at the Wes- 
leyan University, Middletown, Conn.; by Prof. Joun 
JOHNSTON, <- 
XIL. Observations made at onan, China, on tha Shooting 
Stars of the 10th and 11th of August, 1839, in a letter 
from Rev. Peter Parxer, M. D. of Canton, to E. C. 
HeErRIck, - - - - - - 
XIII. Remarks chiefly on the Synonymy of several North 
American Plants of the Orchis Tribe; by Asa Gray, 
McD.” « . - - - - - . . 
XIV. Account of the Capture and Death of a large Alligator, 
XV. Synopsis of a Meteorological Journal, kept in the city 
of New York for the years 1838 and 1839, including 
also the mean results of the last seven _— - by Ww. 
C. RepFie.p, 
XVI. Notice of a Manual 2 Chemiaty : by Prof Yoni W. 
Wesster, M.D., - 
XVII. Engraving and SScasiiilincs of an encentin for ‘the 
Decomposition and Recomposition of Water, employ- 
ed in the Laboratory of the Medical Department of 
«the University of Penn.; by Prof. R. Hare, M. D., 
XVIII. Improved Process for io Potassium ; as Prof. 
Rozert Hare, M.D. - 
XIX. Engraving and Description of a Baas Multiplier, or 
one in which one or more Needles are made to revolve 
by a Galvanic Current; by Prof. R. Hare, M.D., - 
. Crania Americana; or a comparative view of the Skulls 
of various Aboriginal Nations of North and South 
America; to which is prefixed an Essay on the Varie- 
ties of the Human Species, illustrated by seventy eight 
plates and a colored map ; afc Prof. SamueL GeorGE 
Morton, M.D.,_ - - . - - . 
x 
4 
MISCELLANIES.— DOMESTIC AND FOREIGN. 
1. Aurora Borealis of September 3, 1839, —- a 
2. Meteoric Observations in November and eee 1839, 
