Reviews—British Scientific and Technical Books. 527 
head are included also known deposits which are at present entirely 
or comparatively unworked, as well as those from which the metals 
are at present obtained. Thus we read that for aluminium the 
foreign sources of supply are France, Italy, and the United States, the 
present British source is Ireland, and the British sources of the future 
are British Guiana, India, and Australia. The various chapters of 
the book give an interesting assortment of varied information. 
Thus, in that on coal we find accounts of the derivation of the word, 
the origin of coal in geological history, the discovery of coal by man, 
the beginnings of coal mining, the difficulties and dangers of the 
process, the kinds of coal, the probable duration of the supply, and 
the reserves of coal in the Empire. 
aim del, va Wil. 
A CATALOGUE OF BRITISH SCIENTIFIC AND TECHNICAL Books. 
pp. xvii + 376. British Science Guild, 6 John Street, Adelphi, 
London, W.C.2. Price 10s. net. 
(Metts handsome volume, prepared by a Committee of the British 
Science Guild, is a bibliography of standard works on all depart- 
ments of science, using the term in its broadest sense. It cannot 
fail to be of the greatest value to all scientific workers, and is: 
remarkably cheap at the price, as books go now. Mineralogy, 
geology, and paleontology are treated as separate subjects, and 
each is subdivided under different headings. The distinction 
between economic geology and economic mineralogy has evidently 
proved difficult to carry out in practice, as might have been 
anticipated, and these two sections would have been better com- 
bined into one. Also we should like to see added in a future edition 
a few more such books as Lindgren’s Mineral Deposits and Emmons’ 
Economic Geology. The literature of oil geology is also very incom- 
plete. On the other hand, the selection of books on what may be 
called the pure science side is very good, and many standard but. 
out-of-date works are wisely omitted. In this category, however, 
we do not include Lyell’s Elements, which we have been unable to 
find under any heading: this book can never grow old, and should 
be read by all students. 
In this catalogue are given the number of pages, date, name of 
publisber, and price of each book. 
GEOLOGICAL ITINERARIES IN ANGLESEY. By EDWARD GREENLY, 
D.Sc. pp. 12. Liverpool, 1921. 
[alse itineraries were originally drawn up by Dr. Greenly at 
the request of Mr. T. A. Jones, secretary of the Liverpool 
Geological Society, to serve as a guide for leaders of excursions and 
other geologists visiting Anglesey. They contain precise directions 
as to how to reach the different localities, with a summary of what 
