452 Bibliography. 



pages of text will not always be sufficient to explain thoroughly the 

 representations of twenty engravings, whilst in other instances less than 



that space will be required. Thus the explanatory text belonging to 20 

 plates, but exceeding eighty pages, will be furnished with the following 

 20 plates, so that at the end of the work text and plates will run to- 

 gether, and form a complete manual of the enumerated sciences, with 

 a full collection of pictorial illustrations, executed on steel with the 

 greatest care and accuracy. 



It having been deemed of great importance to unite the greatest pos- 

 sible cheapness with beauty and intrinsic value, the great expense of 

 re-engraving the plates has been avoided, and a contract made to se- 

 cure good impressions, taken under the immediate supervision of Mr. 

 Heck, the original framer of the work, from ihe highly finished Ger- 

 man plates; and the specimens now before the puWic will prove that 

 they could not have been produced in this country at less than double 

 the price for which they are now offered. 



A small proportion of the 500 engravings constituting the whole work 

 (about 50, representing astronomy and geography) have inscriptions 

 (chiefly astronomical and geographical names) in the German language, 

 which could not have been altered except at a very great expense. 

 This circumstance will, however, in no way interfere with the perfect 

 clearness of the matter represented, as the accompanying English text, 

 referring strictly to the designs of the plates, gives every explanation 

 required. Besides, a full glossary of all foreign words occurring on 

 the plates will be issued at the end of the work for the benefit of those 

 who wish to make themselves acquainted with the several names and 

 expressions. 



Indexes and tables of contents will be issued with the last part of 

 the work, adapting it to practical use, and facilitating reference to any 

 of the branches of science it embraces. 



Afler the description of the work given, it is needless to add words 

 of commendation. It will be found very widely useful, and we doubt 

 not will command an extensive circulation. 



2. Genera F/orce America Boreali-orientalis illustrata : The Gen- 

 era of the Plants of the United States; illustrated by figures and analy- 

 ses from nature, by Isaac Sprague, Mem. Bost. Nat. Hist. Soc. ; su- 

 perintended and with descriptions, &c, by Asa Gray, M.D., Prof. Har- 

 vard Univ., &c. Vol. II, plates 101 to 186. 8vo, pp. 230. New York, 

 1849. G. P. Putnam. — We take pleasure in announcing the second 

 volume of this truly national work. The authors have undertaken to 

 illustrate all the genera of the plants of the tjnited States with detailed 

 figures and descriptions, and the work should meet not only with appro- 

 bation, but with substantial proofs of favor on every side. This vol- 

 ume includes the orders from Caryophyllacese and Malvaceae, to Poly- 

 galacecR and Krameriacece. The plates are elegant specimens of the 

 art of engraving, and may delight the eye that cannot appreciate all 

 the minute scientific detail so carefully wrought out by dissections and 

 careful scrutiny ; the number included in the volume is 87. 



In the descriptive portion of the work, the generic character of each 

 genus is briefly given in Latin, and is followed by a full synonymy. 

 Then follows a detailed description in English of the parts of the 





