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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 
“* To the solid ground 
Of Nature trusts the mind which builds for aye.’’—WoRDSWORTH 
No. 820, VOL. 32] 
LAURSDAY, UN 
16, [PRICE SIXPENCE 
Registered as a Newspaper at the General Post Office] 
(All Rights are Reserved 
BRITISH ASSOCIATION 
FOR THE 
ADVANCEMENT OF SCIENCE. 
22, ALBEMARLE STREET, LONDON, W. 
The NEXT ANNUAL GENERAL MEETING will be held at 
ABERDEEN, commencing on WEDNESDAY, SEPTEMBER 9. 
PRESIDENT-ELECT, 
he Ricur Hon. Sir LYON PLAYFAIR, K.C.B., M.P., Ph.D., LL.D., | 
F.R.S. L. and E., F.C.S. 
NOTICE TO CONTRIBUTORS OF MEMOIRS.—Authors are re- 
minded that, under an arrangement dating from 1871, the acceptance of 
Memoirs, and the days on which they are to be read, are now, as far as 
possible, determined by Organising Committees for the several Sections 
before the beginning of the Meeting. It has therefore become necessary, in 
order to give an opportunity to the Committees of doing justice to the 
several Communications, that each Author should prepare an Abstract 
of his Memoir, of a length suitable for insertion in the published 7vaxsac- 
tions of the Association, and the Council request that he will send it, together 
with the original Memoir, by book-post, on or before August 12, addressed 
thus:—‘‘General Secretaries, British Association, 22, Albemarle Street, 
London, W. For Section.... sssereeeeseeeees” Authors who comply with 
this request, and whose Papers are accepted, will be furnished before the 
Meeting with printed copies of their Reports and Abstracts. If it should be 
inconvenient to the Author that his Paper should be read on any particular 
days, he is requested to send information thereof to the SECRETARIES in a 
separate note. 
Reports on the Progress of Science, and of Researches intrusted to Indi- 
viduals or Committees, must be forwarded to the Secretaries, for presentation 
to the Organising Committees, accompanied by a statement whether the 
Author will be present at the Annual Meeting. 
No Report, Paper, or Abstract can be inserted in the Report of the Asso- 
ciation unless it is in the hands of the Secretary before the conclusion of the 
Meeting. T. G. BONNEY, Secretary. 
UNIVERSITY COLLEGE, LONDON. 
PRELIMINARY SCIENTIFIC (M.B.) EXAMINATION OF THE 
. UNIVERSITY OF LONDON. 
The following Classes meet the requirements of Candidates :— 
Chemistry.—Prof. WiLLtamson, Ph.D., F.R.S. 
Experimental Physics.—Prof. G. C. Foster, F.R.S. 
Zoology.—Prof. Ray LanxesTer, M.A., F.R.S. 
Botany and Vegetable Physiology.—Prof. OLiver, F.R.S., F.L.S. 
The Courses of Chemistry, Practical Chemistry, and Botany enter into 
the Ordinary Medical Curriculum. 
Prospectuses, including information as to Classes for Matriculation, may be 
obtained from the College, Gower Street, W.C. 
5S TALFOURD ELY, M.A., Secretary. 
RIBBON SECTION CUTTING. 
The Cambridge Scientific Instrument Company have designed a new and 
simple Microtome for cutting continuous Ribbons of Sections of Microscopic 
Preparations on the plan first adopted by Mr. Caldwell. The new instru- 
‘nent has the advantage over the original pattern of dispensing with the 
endless band altogether, and consequently not only avoiding the trouble 
of lifting the series of Sections from the razor, but also of allowing them to 
fall on to the glass slide in their proper position for mounting. Price of the 
Microtome, 45 5s. 
The Company are appointed Agents for the Microscopes of Zeiss, a supply 
of which is kept in stock. 
{THE CAMBRIDGE SCIENTIFIC INSTRUMENT co 
Cambridge, 
Engraved Real Size. 
A NEW ACHROMATIC COMBINATION, 
COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 
PORTABILITY OF A POCKET LENS. 
“Tf you carry a small Platyscopic Pocket Lens (which every observer of 
Nature ought to do).””"—GranT ALLEN in Knowledge. ‘ 
The Platyscopic Lens is invaluable to botanists, mineralogists, or ento- 
mologists, as it focuses about three times as far from the object as the 
Coddington Lenses. This allows opaque objects to be examined easily. 
The Platyscopic Lens is made of four degrees of power, magnifying 
respectively ro, 15, 20, and 30 diams.; the lowest power, having the largest 
field, is the best adapted for general use. 
The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. 
Price of the Platyscopic Lens, mounted in Tortoiseshell, magni- 
fying either 10, 15, 20, or 30 diameters, 18s. 6d. each power. 
Illustrated description sent free. 
JOHN BROWNING, 63, STRAND, LONDON, W.C. 
NEGRETTI AND ZAMBRA, 
SOLE MAKERS OF 
JORDAN’S (PATENT) SUNSHINE RECORDER. 
PRICE £3 3s. 
NEGRETTI 
ZAMBRA, 
Screntiric INSTRUMENT MAKERS 
TO THE QUEEN, 
HOLBORN VIADUCT. 
Branches :—45, Cornhill ; 
122, Regent Street, London. 
Lllustrated Description Post Free. 
: 
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: NEGRETTI & ZAMBRA’S 
Large Illustrated Catalogue, 
600 Pages, 
1200 Engravings. 
Price 5s. 6d. 
