Notices of Books . 
[February, 
190 
Coal ; its History omd Uses. By Professors Green, Miall, 
Thorpe, Rucker, and Marshall, of the Yorkshire College. 
London : Macmillan and Co. 1878. 
A series of Ten Ledtures delivered by the Professors of the 
Yorkshire College at Leeds and Keighley, in accordance with a 
suggestion made by Dr. Carpenter, the Secretary of the Gilchrist 
Educational Trust. These Ledtures were afterwards revised, 
put together in a consecutive form, and illustrated with nearly 
sixty woodcuts. The subjects treated of are — the Geology of 
Coal, by Prof. Green ; Coal Plants and Animals, by Prof. Miall ; 
the Chemistry of Coal, by Prof. Thorpe ; on Coal as a Source of 
Warmth and Power, by Prof. Rucker ; and, lastly, on the Coal 
Question, by Prof. Marshall. 
Science made Easy . A Series of Ten Familiar Ledtures on the 
Elements of Scientific Knowledge most required in Daily 
Life, &c. Parts I. to VI. By Thomas Twining, Author of 
“ Technical Training.” London : Hardwicke and Bogue. 
The first four parts of this work, which originally appeared in 
1871, having speedily run out of print, Mr. Twining has taken 
the opportunity afforded him by the publication of Parts V. and 
VI. to thoroughly revise them, and bring down the knowledge 
contained in them to the present year by adding a postscript to 
the reprint of each of the four parts. The discoveries of MM. 
Pidtet and Cailletet in relation to the liquefadtion of oxygen, 
hydrogen, and nitrogen, De la Bastie’s method of making tough- 
ened glass, and several others are noticed in their proper places. 
In other respedts but little change has been made in the work. 
The last two parts contain four Ledtures, entitled — A Glance at 
the Mineral Kingdom, with Notions concerning the Vegetable 
Kingdom ; Outlines of the Animal Kingdom ; and, lastly, a 
double Ledture on the Outlines of Human Physiology. The 
diagrams to this part of the work are drawn upon a black ground, 
which gives them an appearance of relief that is a very great 
help to the understanding. This is especially apparent in the 
diagrams relating to cell strudture. The experiment was made by 
Mr. Twining in instituting Working Class Examinations in dif- 
ferent parts of the country ; and a programme is now issued 
yearly from the Economic Museum, Twickenham, giving full 
particulars of the regulations, certificates, and prizes, as well as 
the facilities offered to Institutions in the metropolis for the 
delivery of the Course. We are glad to see that Mr. Twining’s 
praiseworthy and intelligent exertions in the cause of the spread 
