1874.] Notices of Books. 535 
inventions which we hardly look for in an ordinary treatise on 
the Principles of Mechanics. We may substantiate our state- 
ment by reference to the descriptions of Giffard’s Injector, 
Blake’s Stone-Crusher, the Moncrieff Gun-Carriage, Whitworth’s 
Measuring Machine, and many other ingenious mechanical in- 
ventions. In fact, the author constantly seeks to interest the 
student by keeping the practical phase of the subject before him. 
Prof. Goodeve evidently has no notion of a student learning 
Mechanics by merely mastering abstract principles and acquiring 
dexterity in the application of formula. If such knowledge is 
to be any real service to a man, it must be supplemented by 
practical knowledge, such as may be gained in the workshop. 
“* Mechanics,” says Prof. Goodeve (p. 40), ‘‘cannot be learnt 
from books alone. The student must go out into the world, and 
see how mechanicians and engineers accomplish what they do; 
he must continually reason upon what he sees, and, retaining a 
firm hold of mechanical principles, he may thus gradually obtain 
a knowledge and mastery of his subject.” 
Elements of Metallurgy. A Practical Treatise on the Art of 
Extracting Metals from their Ores. By J. ARTHUR PHILLIPS, 
M. Inst. C.E., F.G.S., F.C.S., &c. Illustrated by numerous 
Engravings on Wood. London: Charles Griffin and Co. 
1874. 
RATHER more than twenty years ago Mr. Phillips wrote an ex- 
cellent ‘‘ Manual of Metallurgy,” which originally formed one of 
the volumes of the ‘Encyclopedia Metropolitana.” This 
manual passed through three editions, and a fourth has been 
long expected. Instead, however, of publishing a new edition 
of this Manual, the author has followed the far preferable course 
of presenting us with an entirely independent work. It is pro- 
verbially injudicious to put new wine into old bottles, and it has 
too often been found that to insert a quantity of new matter into 
an old text-book produces a result which is the very reverse of 
satisfactory. We are therefore not sorry to see the older work 
superseded by one which treats the entire subject from a modern 
point of view, and which may be thoroughly relied upon for 
giving its information quite up to date. Such a work was much 
needed, and the need could hardly have been better supplied 
than it has been by Mr. Phillips. 
After a brief sketch of the history of Metallurgy, the author 
describes the various physical properties of the metals, and then 
enters into a detailed description of fuels and fire-clays. This is 
followed by a full notice of each metal, and the methods em- 
ployed for its extraction, the several metals being treated in the 
following order :—Iron, cobalt, nickel, aluminium, copper, tin, 
antimony, arsenic, zinc, mercury, bismuth, silver, gold, and 
