oe The next No. of this Journal will be published on the first of Jule. : 
CONTENTS. 
Art. XXXII. On the Electrotyping Operations of the U. 8. Coast 
Survey ; by Gzorce Maruior, Electrotypist: being a Re- 
et to Major I. I. Stevens, Assistant in — of the Coast 
urvey Office. With a Plate 305 
XXXIIL Brief Characters of some New Givers end Species of 
yctaginacer, aap eile “Poneeaa in Texas and New 
aa PY. io es Wricut, Esq., under the oe of 
Col. J. D. Granam; by res Gray, M.D., 319 
_ XXXIV. On the eee th of twa species of Trichomanes in the 
3 State of Alabama, one of which is new ; by Asa Gray, M.D., 324 
V. On a method of exhibiting the Phenomena of Diffraction 
with the Compound Microscope; by Ocpen N. Roop, A.B., 327 
XXXVI. —— ore Chromic Iron ; be Tuomas 
H. 
XXXVI. On id Causes which may have peidoced Changes in the 
____ Earth’s Superficial Temperature ; by W. Hopkins, Esq.,ete., 334 
XXXVIII_ Observations on a eeuls discovered Animatcule ; by 5 
| at: gly Wo Basury, 341 
XXXIX.. A Coasi ie miler PEERS, takes Res ccaccie nied Lass of ; 
Sound, and their application in the Cunstruciion of uildings ‘ 
des igned especially for Musical Effect; by J. B. Urx ax, M.D., 348 
XL. Noticn of the Meteoric Tron found near Seneca River, 
367 
: orth Carolina; by C. L. Hunter, 3 
XLII. Review of Mr. Blake’s Article on the Blow of Elastic 
._.Fluids; by Jorn E. Henprtces, . 
ably. On a New System of Electro: Megnits; ay M. J. Niceuis, 380 
5 
387 
. Abstract of scampi Observations made at Bur'i Kid 
ton, Vi., in 1852. by Z. THompso 
TL. Some Account of the Proteus enguinus by Iso. ie 
atron, Jz., M.D. Wha Plate, - 4 
1 Eriesson’s Hot Ais, on * Calorie Engine : by P Prof a 
aot A. nfeenrON we 
C1ENTIFIC INTELLIGENCE. 
ridenee of M. J. Nicklas ; “On the Verification of a ag i 
Stan Ww in a Vaewum, 417.—Caloric Engi 418. oe 
, als. 
