: It is quite unnecessary to say any thing in praise of Mrcwaux’s| 
magnificent work on the Forest Trees of our country ; the well es- 
tablished reputation of Mr. Nutra, the editor of the additional 
part of the work, is a sufficient guaranty for its accuracy and the 
style of its execution. The Plates, which will amount to about 200, 
will be finely and carefully colored. It will be published in four 
volumes, in imperial octavo. The first volume is expected to be 
ready in July, 1841, and the succeeding volumes at short intervals, 
so that the whole shall be completed during the present season. 
The price of the whole work, with the Plates finely colored, will 
be thirty dollars—the first and second volumes, eight dollars each ; ; 
and the third and fourth, seven dollars each ; payable on delivery of 
each volume. With the Plates uncolored, the price will be five 
dollars per volume. 
Those persons who possess the former edition of Michaux’s work, 
can procure the additional volume separately, and thus complete 
their copies. Price with colored Plates, seven dollars ; with Plates 
uncolored, five dollars. They are requested to transmit their names 
as early as possible. 
A list of the subscribers to this splendid work, will be published in 
the last volume. 
ubscriptions received by the Publisher, or at the office of the 
American Journal of Science and Arts, New Haven, Ct. 
J. DOBSON, No. 106, Chestnut Street, Philadelphia. 
J. DOBSON has also in course of Publication, 
MonoGrapPHy oF THE FAMILY Unionipa, or Natapes or Lamarck, 
(fresh-water bivalve shells,) or Norra America—illustrated by 
figures drawn on stone from nature, and finely colored. By ‘T. 
. Conrav, Curator of the Academy of — Sciences of 
Philadelphia, &c. &c. &c. Of this work, Nos. 1 to 12-have 
been published—each number contains five finely colored Plates ; 
price per number $1. Also, by the same author, 
Fosstus or tae Mepiat Tertiary or THE Unirep States. Of 
this work =< been published No. J, containing 17 Plates, ators 
$1.50—and No. 2, containing 12 Plates, price $1—to be 
pleted in four numbers. 
A SOMABAATH or THE Limniapes, or Fresu-Warer Univatve 
ELLs or Norra America, by S. S. Harpeman, Member of 
i Academy of Natural Sciences. Nos. 1 and 2 published, each 
containing 5 most splendid colored secs price $1 each, to be 
completed in about eight numbers 
