36 SCIENCE 
skies, which have been described by Arctic ex- 
plorers. In the Arctics there is always a 
fringe around the ice masses where the win- 
ter’s snow is ‘all melted during the summer. 
In the Antarctics this is not the case, as the 
snow line extends quite to the sea level. The 
discussion of the various forms of ice masses 
and the formation and appearance of icebergs 
is most interesting. Glacialists will find 
much to interest them in this book and also 
many explanations with which they will not 
agree. For instance, the author thinks that 
the alimentation of the Arctic ice occurs 
largely at its borders and is due to the snow 
being driven off the ice cap by the wind and 
piling up, around the edges, forming a con- 
vex surface, like a sand dune; it is hard to 
reconcile this with retreating glaciation. Also, 
the figure on page 139 would hardly have been 
inserted if the author had carefully considered 
the lines of flow of glacier ice. 
The book is profusely illustrated and the il- 
lustrations elucidate the text; every one of 
them is referred to and they make the descrip- 
tions very vivid without the use of too many 
words. The reproduction, on the same scale, 
of plans of a number of glaciers, in plate 11, 
and Fig. 134, is very instructive. The numer- 
ous references at the end of every chapter will 
be very acceptable to those who desire to con- 
sult the original articles. 
Harry Firipine Rem 
Fortschritte der Mineralogie, Kristallographie 
und Petrographie, herausgegeben im Auf- 
trag der Deutschen Mineralogischen Gesell- 
schaft, von Dr. G. Linck, Jena. Gustay 
Fischer, Jena, 1911. Pp. 290. 
The German Mineralogical Society has 
undertaken to publish annually a report of 
progress in various fields of investigation re- 
lated to mineralogy. This interesting first 
yolume gives promise of a successful series. 
Dr. Linck is editor in virtue of his office as 
secretary of the society; the authors of the 
papers are specialists in their various fields 
and the presentation is intended to be popu- 
lar. The varied subject matter shows how 
wide is the field to be covered. ‘There are 
[N.S. Vou. XXXV. No. 888 
twelve reports as follows. H. Baumhauer 
(Freiburg) treats of the Law of Complica- 
tion and the Development of Orystal Faces in 
Complex Zones, accepting and elaborating 
Goldschmidt’s work (17 pp.); O. Miigge 
(G6ttingen), On the Twin Structures of 
Crystals (80 pp.), and F. Becke (Vienna), On 
the Formation of Twin Crystals (18 pp.), dis- 
cuss very fully modern points of view as to 
definition and development of twinning; A. 
hitzel (Jena) treats of the recent literature 
on Velocity of Crystal Growth and Solution 
(13 pp.). Under the heading Mineralogy, R. 
Mare (Jena) summarizes the literature on the 
Phase Rule and its Application to Mineralog- 
ical Questions (30 pp.); R. Brauns (Bonn) 
deals with the Causes of the Color of Faintly 
Colored Minerals and the Effect of Radium 
Rays upon the Color (12 pp.); A. Bergeat 
(K6nigsberg), reviewing the Genetic Inter- 
pretation of the North- and Middle Swedish 
Tron-ore Deposits in Recent Literature (18 
pp.), shows the modern tendency towards re- 
garding them as of magmatic origin; A. 
Sechwantke (Marburg) gives a descriptive list 
of new minerals which have been described 
since 1898, arranged alphabetically without 
references to literature (20 pp.). Under the 
heading Petrography, F. Rinne (Leipzig), on 
Saltpetrography and Metallography in the 
Service of the Study of Eruptive Rocks (37 
pp.), shows the bearing of such physico-chem- 
ical investigations as those of van’t Hoff on 
the Stassfurt salt deposits upon the interpre- 
tation of processes of crystallization in igneous 
magmas; EF. Becke (Vienna), in Advances in 
the Province of Metamorphism (386 pp.), re- 
views 87 papers which have dealt with this 
subject in the past three years. Under 
Meteorites, F. Berwerth (Vienna), Advances 
in the Knowledge of Meteorites since 1900 
(28 pp.), gives a complete bibliography of 394 
entries, covering what has appeared on meteor- 
ites since the publication of Wiilfing’s book, 
together with critical reviews of many papers. 
Lastly H. E. Boeke (Halle) gives a brief ac- 
count of the work of van’t Hoff, especially as 
it bears upon mineralogy and geology. 
