CONTENTS. 
ae XII. On the Measurement of the Pressure of Fired Gun- 
_ BRIDGE, M.D., 
Description of the War -paper process Ae for. the 
~ Photo-Méteorographic Registrations at the Radelitle Obser-- 
yatory ; by Wittiam Crookes, Es 
| xv. Ona cate mineral (allied to siilbite). from ike Ile of 
Bee by J. W. Mazrer, Ph.D., eae 
; xv. On the “Arp lioasee of the Mechanical Theory of Heat to 
the Steam Engine; by R.Cuavsivs, — - 
| XV . Statistics of ane Flora of the Northern Uaited Sites . 
_ Asa Gray, - 
XVIE. Letter on iis Mises of Fiecrioal Sesion oy of Great 
~~ Britain; by Sir Ropvericx I. Murcutson, : 
| xvi Remarks on the Genus Tetradium, with Neitces of ines 
3 Species found ir Middle ——. by Prof. J. M. Sar- 
FORD, ae M., - ‘ 
Fossil Shell in. ok Connecticut River Sandstone; Z 
i 
{ 
| 
| 
ie 
ce 
} 
j 
Tawaii hy ae Tervs Coit, ae 
rt 1 of eee hers: ; “by M. Er- 
' nest NickLes, 
XII. Third Sapien to Dens s ‘fisalagy <7 he halbers 
: XSI Correspondence of M. Jerome Nickris—Academy of 
Sciences—Death of M. Binet: Agricultura 
bition: Fecula of the Horse-chestnut, 264. 
stro nomy : . 
ological Sysiem of France, 266.—Inundations : Electricity _ 
—Substiture for the copper wire in the construction of He- 
Tices, 267.- —Effects with Ruhmkorff’s Apparatus of Induc- 
_ powder i in its Practical ia ete By? Witiiam E. Woop- 3 
1538 
tiversal Exhi- | 
“As 
View of a part of the surface of the Moon, 265.--Meteor- 
leet tric Chronometers: Gas and Steam Manometer | 
On a Cause of See id eepta 268.— : 
