FO BS th) LL ke 
THE 
WITH WHICH IS INCORPORATED 
Pye Seta) C2 Ges, CS) Gor les Bees 
of Geology. 
| EDITED BY =: 
HENRY WOODWARD, LL.D., F-R.S., F.G.S., &c. 
| 
; | ASSISTED BY 
‘ — _ Prornssor J. W. GREGORY, D.Sc., F.B.S., F.GS. 
| : Dr. GEORGE J. HINDE, F.R.S., F.G.S. 
Sm THOMAS H. HOLLAND, K.C.1E., A.B.C.S., D.Sc., F.B.S., F.G.S. 
: Dr. JOHN EDWARD MARR, M.A. Sc.D. (Came.), F.R.S., F.G.S. 
g Dr. J. J. H. TEALL, M.A., ScD. (Cams.), LL.D., F.R.S., F.G.S. 
PROFESSOR W. W. WATTS, Sc.D., M.Sc., F.R.S., Vich-PRES. GHOL. Soc. 
GEOLOGICAL MAGAZINE 
: Monthly Journal 
Dr, ARTHUR SMITH WOODWARD, F.R.S., F.L.S., Pris. 
Grou. Soc, 
APRIL, 1916. 
I. ORIGINAL ARTICLES. 
Two large Obsidianites from the 
Raffles Museum, Singapore. By 
Je BS SCRIVENOR, M.A., F.G.S. 
= (Plate VII.) .. 
Ball or Pillow-form. Structures in 
Sandstones. By BERNARD SMITH, 
M.A., F.G.S. (With 8 Text- 
figures. ) Sa Sot onan nae 
The ‘‘Pietre Verdi’’ of the 
Piémontese Alps. By C. 8S. Du 
ad RICHE PRELLER, M.A., Ph.D., 
al M.1.E.E., F.G.S. ses 
Petrological and Quantitative 
| Methods. By P. G. H. BOSWELL, 
=|). A.R.C.Se., F.G.S. (Concluded.) 
5 On the genus Trinucleus. By 
ce RF. KR. CowrPer REED, Sc.D., 
en F.G.8. (Coneluded.) 
Il. Revinws. 
Professor J. Joly. Radio-activity . 
G. D. MeGrigor. Field Analysis 
of Minerals ... 
J. _V. Lewis. Determinative 
Mineralogy ... 
Page 
. 146 
. 156 
163 
es 
Ge @eNeor Ey Nhe & 
Page 
REVIEWS (continued). 
Rutley’s Elements of Mineralogy . 179 
Lawson’s Profiles of the Desert ... 180 
Brief Notices: ‘Triassic Rocks of 
Wirral— Zoogeography—Form of 
the Harth — Shallow - water 
Deposits—Faunistic Influence— 
Geologists’ Association — The 
Zoological Record — Obsidian 
from Iceland cel SOs 
Ill. REPORTS AND PROCEEDINGS. 
Geological Society of London . 182 
Hdinburgh Geological Society . 188 
TV. CORRESPONDENCE. 
Dr. J. W. Evans, F.G.S. . 189 
V. OBITUARY. 
Professor J. Wesley Judd - 0) 
VI. MISCELLANEOUS. 
The Closing of National Geological 
Collections ... . 192 
LONDON: DULAU & CO., Lrp., 87 SOHO SQUARE, W. 
. price 26s. net, 
‘> The Volume for 1915 of the GEOLOGICAL MAGAZINE is ready, 
Glee Cases for Binding may be had, price 1s. 6d. net. 
