134 



Rev'ieivs and Notices of Boohs. 



inches be the amount of oxygen consumed be v\ and the volume 

 of the carbonic acid formed be v" and designating by x, y, and z, 

 the respective bulks of the hydrogen, marsh gas, and carbonic 

 oxide, we will have the three following equations : — 



"(1.) x + y + z = v. (2.) :Lx + 2y + lz = ,f. (3.) y + z = v\ 



" Equation (1) does not require any explanation. 

 Equation (2) expresses the fact that for its combustion 

 hydrogen requires half its volume, marsh gas twice, and carbonic 

 oxide half its volume of oxygen. 



^' Equation (3) assumes, what is also the result of experiment, 

 that marsh gas and carbonic oxide, when burned with oxygen, 

 give their own volume of carbonic acid. 



'* From the solution of this simple equation we deduce the 

 values of x, y, and z. They are as follows :— 



x = v — v" 



y 



3 



. = . ^' 



These extracts are sufficient to show the mode in which the 

 subjects are treated. We consider the work as an excellent con- 

 tribution to the teaching department of chemistry ; as well worthy 

 of the reputation of its author, and as admirably fitted for the use 

 of students. 



On the Popular Names of British Plants ; heing an Expla- 

 nation of the Origin and Meaning of the Names of our 

 Indigenous and most commonly cidtivated Species. By 

 K. 0. Alexander Prior, M.D., F.L.S., Fellow of the 

 Eoyal College of Physicians of London. 8vo. London : 

 Williams and Norgate. 1863. 



This is a curious work, written by a medical man of high lite- 

 rary attainments, and who at the same time possesses extensive 

 and accurate botanical knowledge. It is a welcome addition to 

 our botanical literature. The author's acquaintance with the lan- 

 guages of Greece and Home, and with those of modern Europe, 

 including Scandinavia, and his intimate knowledge of plants, 

 acquired during travels to various parts of the Old and New 

 World, render him peculiarly qualified for the very difficult task 

 which he has undertaken, and give force and authority to his 

 opinions. We recommend the work as well worthy of perusal, 

 and as containing many interesting remarks on the etymology of 

 the common names of British plants. 



