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8 
Memoir sur les Variations Du Barometree” Pres. Eb’ Eainbourg, 
Par M. J. D. Forbes, 1832. From the Author. 
1826-27, 28-29,. 32-34. 
Neues Jahrbuch fiir Mineralogie, Geniauasi, &c. From Proffs. 
Leonard and Brown. Heidelberg, G ayany, 1834-5. 
Experimental Researches on Elect , ninth series. Lon. 1835, 
by Prof. Faraday. From the Autho 
NOTICE. 
The Editor now announces to his correspondents, and the public, 
that the next number of this work, will be devoted chiefly, to an 
elaborate account of the great coal formation in the valley of the 
Ohio, and in the valleys of the confluent rivers. ‘This memoir has 
been, at the Editor’s request, prepared with great labor and consid- 
erable expence, by Dr. Hildreth, of Marietta, Ohio, from personal 
examination by himself, or by his friends and correspondents. It 
will be illustrated by numerous wood engravings of sections of the 
coal strata, and drawings of fossil plants, shells and other organic re- 
mains, with some sketches of the scenery of the coal regions, and a 
large geological map engraved on copper. As the expense of the 
illustrations is too heavy for the resources of the Journal, aa extra 
number of copies of this memoir, and of the drawings will be print- 
- ed for separate sale, as it is to be presumed that many persons will 
~“avish to possess this very valuable document. In order that we may 
‘print it entire, it must necessarily engross the greater portion of 
the No. and, therefore, our other correspondents will, we trust, pa- 
tiently wait, until we can return to our usual variety of articles. 
"A reprint of No. 1, Vol. XXVIII, is in the press, and we shall 
soon be able to supply those who have applied or may apply for it. 
Correspondance Pour L’Avancement de la Meteorologie. Pe ssh 
