288 SCIENTIFIC NEWS. 



Atkins on the or " 34 over-proof." We here find fome arithmetical rules 

 fpecific gravities introduced for the purpofe of illuftrating the practical facilities 

 liquors. refulting from the ufe of fuch a fyflem, and the chapter con- 



cludes with a feclion. on the general conftru&ion of the hy- 

 drometer, in -which, however, the authors have modeftly for- 

 borne to fpeak particularly of thofe of their own conftru&ion, 

 whicli are already fo well known to the public. 



In the fourth chapter, which treats of the experiments and 

 tables of Mr. Gilpin, the author fpeaks with its merited praife 

 of this great work, and in the fifth they give a variety of rules, 

 •V. ' fome of them very curious, for folving all the moft ufeful pro- 



blems refpecting this fubjeel from thefe tables, which they con- 

 fider as an authentic regifler of experimental refults. Thefe 

 procefles are all founded on the fuppofition that proof fpirit is 

 of the fpecific gravity of 920 at 60°. 



The lixth and laft chapter contains the two tables of the 

 authors already mentioned, with their ufe and application. 

 Thefe tables in a great meafure anfwer all the purpofes of the 

 more voluminous ones of Mr. Gilpin, from which they are cal- 

 culated b^ the preceding formulae, and that in a much Ampler 

 and eafier manner, being adapted to the prefent ftandard of 

 proof, and giving the required per-centage and concentration 

 by mere infpe&ion. 



Having thus ftated the outlines of this work, it would be to 

 take notice of a circumftance of minor confequence if I re- 

 marked, that it is a very- neat fpecimen of typographical ele- 

 gance. The fubjecl is a moll important one, and the philofo- 

 phical reader will be pleafed to find it here treated in a man- 

 ner which renders it no lefs worthy of the attention of the man 

 of fcience, than of thofe whofe commercial interefts are in- 

 volved in the event of the prefent inveftigation. 



A. B. 



