84 
lead, the decrease being almost exactly. proportional to 
the decrease in atomic weight in these samples, so that 
' the atomic volume (18-281). is constant.—National.Re- 
search Council; A preliminary report to the president 
of the Academy of the Organising Committee (Messrs. 
E. G. Conklin, S. Flexner, R. A. Millikan, A. A. 
Noyes, and G. F. Hale, chairman) of the National 
Research Council, established by the Academy after 
conference with the President of the United States for 
the purpose of co-ordinating the research elements of 
the country in the interest of national security and 
welfare. 
Care Town. 
Royal Society of South Africa, August 16.—Dr. L. 
Péringuey, president, in the chair.—R. E. Walker: 
The granite of the Schapenberg, Somerset West. The 
granite of the Schapenberg is essentially a grey, biotite- 
granito-porphyry intrusive in fine-grained, argillaceous 
grits of the Malmesbury series. It is essentially an 
apophysis of one or other of the two large granite 
masses—the Kuils River granite and the Sir Lowry’s 
Pass granite—which oceur the one to the west and 
the other to the east of the Schapenberg; most prob- 
ably of the latter. Both fine- and medium-grained 
varieties occur. At certain points along the contact 
the granite, owing to absorption of material from the 
invaded formation, is andalusite-bearing. The granite, 
particularly near ‘its margin, has been subjected to 
pneumatolytic action, which has caused the formation 
of a series of altered granites ranging from school 
granite on one hand to greissen on the other. The 
greissen is a quartz-mica-tourmaline rock resembling, 
in most respects, that of Grainsgill, described by Mr. 
Alfred Harker in the Q.1.C.S.—J. S. v. d. Lingen: 
The radial lines in R6ntgen interference patterns. 
The author briefly discussed the theory of radial lines, 
and pointed out that on Friedrich’s assumption these 
lines ought to be present in all interference patterns. 
Experiments were then described, which support the 
view put forward by von Laue and the author, viz. 
radial lines are caused by weakening of the lattice 
of a rigid crystal. The pattern of Mg(OH),, where 
the water molecules were driven off, and resublimated 
iodine, were exhibited, as well as the pattern of sylvine 
obtained by Friedrich. The pattern of this iodine 
shows the transition stage from a three-dimensional 
grating to a two-dimensional grating. MgO from 
Mg(OH), shows the two-dimensional grating only. 
“Baurite from biotite’? shows the two-dimensional 
grating by treating biotite with acids.—E. J. Goddard : 
Some observations on Ozobranchus branchiatus. 
This paper contains an account of the leech (Ozo- 
branchus branchiatus). Some historical interest 
attaches to the form, inasmuch as it was probably 
the first Annulate noted from the. Australasian region. 
The specimens were obtained as parasites on the 
green turtle. The somite is represented in a very 
primitive condition, and it is of interest to note that 
the limitation of the genus to Chelonia as_ parasites 
is possibly, as in that of Branchellion to Pisces, indi- 
cative of an old association, and bearing out the 
morphological evidence that these forms are archaic 
and primitive, and ancestral to the Gnathobdellida and 
Herpobdellida. The paver, deals with the constitution 
of the somite in the various, regions of the body, and 
the conclusions to be derived from the same. 
BOOKS RECEIVED. 
The Flotation ‘Process. Compiled and edited by 
-T. A. Rickard: Pp. 364.° (San Francisco : - Mining 
‘and Scientific Press.) “8s. 6d. net. 
~A Glossary of Botanic Terms-with their - Desivatien 
and Accent. By B. D. Jackson. (Third edition. - Pp. 
“xi+427. (London: Duckworth and Co.) 7s. 6d.-net. 
NO. 2448, VOL. 98] 
NATURE 
t 
[SEPTEMBER 28, 1916 
British and Foreign Marbles and other Ornamental 
Stones. By J. Watson. Pp.x+485. (Cambridge: At 
the University Press.) 5s. net. 
Alternating Currents in Theory and Practice. By 
W. H. N. James. Pp. vi+353. (Cambridge: At the 
University Press.) 10s. 6d, net. 
The Royal Horticultural Society’s True Work. By 
A Life Fellow of ‘the Society. Pp. 2 (London : 
Simpkin and Co., Ltd.) 6d, net. 
A Bibliography of British Ornithology from the 
Earliest Times to the End of 1912. By W. H. Mullens 
and H. Kirke Swann, Part iii, (London: Macmillan 
and Co., Ltd.) 6s. net. 
Organic to Human : Psychological and Sociolo, ogical. 
By Dr. H. Maudsley. Pp. viiit+386. (London: 
millan and Co., Ltd.) 12s, net. 
Bacon’s War Maps. Europe, embracing all the 
Countries Involved. (London: G. W. Bacon and Co., 
Ltd.) 6d. net. 
The Student’s Handbook to the University and Col- 
leges of Cambridge. Fifteenth edition, revised to June 
30, 1916. Pp. 14+704. (Cambridge: At the Univer- 
sity Press.) 3s. net. 
Memories. By E. Clodd. Pp. xi+288. (London: 
Chapman and Hall, Ltd.) tos. 6d. net. 
CONTENTS. PAGE 
Industrial Associations “es .)<.)/ - . . ae 
Science and the Savant........ », oe 
Star-bearings for Night-marching. By H. E, 
Goodsonis- ae , . 
General Chemistry. By W. C. McC. L. ogy, OR 
Industry and Conimerce gee ses Se 
Our Bookshelf ...... BCE Gis sc ae eee 
Letters to the Editor:— , 
Science in Education.—F.R.S.; F.B.A. ..... 69 
The Third Fossil Tsetse-fly.—Prof. T. D. A. — 
Cockerell ... peek 4] 
The Designation of Hours.—C. H. Collings . os Sage 
Archeology of the Middle Americas. (///ustrated.). 70 
The Abnormal Propagation of Sound bythe Atmo- 
sphere. By Dr. C. Davison’; ... . + 6's a 
Sir Lauder Brunton, Bt., F.R.S. ByC. A. .... 72 
INOtes) re ee . o Gee hep eels os 5 
Our Astronomical Coluniaiae » 
Encke’s ‘Comet: .. .. me ie sx bs ° > Sheena 
The Nebula Hii. 78 Leonisiiiee. => = «) lle a 
Photographs of Mars roe hf 
Spectrum of the Nebula H iv. 39 Argis” ae 77 
The United States National Research Council, By 
Prof. G. E. Hale Speen 
The Government Cinchona Plantations i in Bengal. 79 
The British Association at Newcastle :— ; 
Section A.—Mathematical and Physical Science.— 
Opening Address (Abridged) by Prof. A. N. White- 
head, Sc.D., F.R.S., President of the Section 80 
University and Educshionsl Intelligence... . i) die 82 
Societies and Academies .......'. . ++ « s980 
Books Received . . «Seabee <>. 
Editorial and Publishing Offices : 
MACMILLAN & CO., Ltp., 
ST. MARTIN’S STREET, LONDON, W.C. 
Advertisements and business letters to be addressed to the 
Publishers. 
Editorial Communications to the Editor, 
Telegraphic Aadress: Puusis, LONDON. 
Telephone Number: Gerrarp 8830. 
