Notices respecting New Books. 219 



forces at the point K ; in vvliich case the vertical having its di- 

 rection parsing througii the iised point A \vill taily become in- 

 effective, aiu ilieie will remain tlie product K H x K A, (or the 

 moment of tlie force hy which the bank tends to overturn the 

 wail: bnt here a>^aiii it is obvious, that if tlie earth at the back 

 of the wall be only so high that the line G F |)roduced meet the 

 base of the wall in the point A, the stability is the same as be- 

 fore anv pressure took place : and if the line F G produced, cut 

 the vertical C A, the stability will be diminished ; but if it meet 

 any point in the base A B, it will be increased. We have before 

 observed, that these deductions are exactly conformable to the 

 experimental results of Col. Pasley; and as to the point ivhich 

 we have assu'.ned, or rather theoretically determined, for our 

 point of application, it has been verified by the experiments of 

 Gauthey ; and therefore, thus far experiment and theory go hand 

 in hand ; which is always satisfactory to observe, particularly in 

 cases where they have hitherto been found to give incomparable 

 and anomalous results." 



The bistoricd division is introduced by a chapter, in two parts, 

 ▼iz. I. On the uses of history as a study; and 2. On the sepa- 

 ration of the early facts of history from fable. 



These introductory essavs are followed by a chapter on the 

 Antedihivian Period — another on the Patriarchal Age, and the 

 lives of Moses, Joshua, Sosostris, and Theseus. 



The fourth division is formed on a plf.n intended to combine 

 all the uses of an English Leiiicon with those of a miscellaneous 

 Dictionary of Science. In the former character it promises to 

 present a much more complete history of our language than has 

 yet been attempted. 



" Bv commencing with authorities wherever they can be de- 

 tected, from the earliest periods of English composition, and 

 continuing them successively through the different stages by 

 which it has arrived at its present state of copiousness and re- 

 finement, this Dictionary," say its vi'riters, " will aspire to the 

 pretension of exhibiting to the English reader a sketch at least 

 of some very interesting and instructive portions of a history of 

 his own language." 



The plates by Davis, Landseer, &c. are neatly and even ele- 

 gantly executed. 



Mr. S. F. Gray (apothecary and teacher of botany and ma- 

 teria medica) has in the press and nearly ready, a work intended 

 to serve as a Supplement to the several Pharniacopueias, con- 

 taining the medical uses of all such plants as have been hitherto 

 examined, and an arrangement of their uses, a glossary of the 

 terms and contractions used by physicians in tlieir prescriptions : 



usual 



