REVIEWS 295 
other deposits of economic value, including iron, chromium, manganese, 
copper, tin, cobalt and nickel, zinc, lead, silver, gold, platinum group, 
tungsten, molybdenum, antimony, bismuth, cadmium, arsenic, mer- 
cury, precious stones, coal, graphite, petroleum, natural gas, ozokerite, 
asphalt, salt, soda, borax, niter, soda niter, barytes, sulphur, iron pyrites, 
feldspar, fluorite, mineral pigments, abrasives, marble, limestones other 
than marble, building stones in general, kaolin, clay, bauxite, aluminum, 
glass sand, refractory materials, natural fertilizers, monazite, road 
materials, soils and water. Under each of these headings is given a 
brief account of the chemical and mineralogical character of the 
material under discussion, its mode of occurrence, its distribution, and 
other technical or commercial data of interest, together with a list of 
the more important literature on the subject. The volume closes with 
a few very pertinent remarks and suggestions on the subject of reports 
on mining properties, and with a list of references to works on mining 
law. 
The lists of literature given in the volume contain the more impor- 
tant publications on the different subjects treated, and though, as the 
authors themselves say, they have not attempted to make the bibliog- 
raphy complete, yet the references which they have given are all 
useful and will be found to be a ready guide to those who wish to 
follow up the subject further. For the student, this system is espe- 
cially useful, as he gets in the syllabus only references to thé most 
important literature, and is not encumbered with what is not immedi- 
ately necessary for his purposes; at the same time he has the means of 
finding any other literature that may exist on the subject. A very 
useful feature of the volume are the blank pages which alternate with the 
pages of printed matter, thus giving means of inserting further refer- 
ences to literature or making short notes, etc. 
The volume contains 141 illustrations including geological sections, 
sections of ore bodies and of mines, statistical tables, etc., all of which 
add greatly to the usefulness of the work as they make it possible in a 
condensed form to understand clearly the various subjects discussed. 
The volume relates mostly to the economic geology of the United 
States, but that of foreign countries is occasionally mentioned. It 
covers a wide field in a form which though condensed is sufficiently 
full to answer all the purposes for which it is intended. It is a most 
valuable work, and the thanks of all interested in economic geology 
are due to the authors who have prepared it. OUR ovale! 18S dees Tis, 
