Ivili 
KING’S COLLEGE, LONDON. 
CURATORSHIP OF THE ANATOMICAL MUSEUM. 
This Appointment is now vacant. For information apply to 
J. W. CUNNINGHAM, Secretary. 
CITY AND GUILDS OF LONDON 
INSTITUTE. 
CENTRAL INSTITUTION. 
Summer Courses of Lectures and Laboratory Instruction for TECHNI- 
CAL TEACHERS and others to be held in the Institute’s New Buildings 
in EXHIBITION ROAD. 
I. On the Teaching of GEOMETRY in its TECHNICAL APPLI- 
CATIONS— 
By Prof. O. Henric1, LL.D., F.R.S., commencing on Monday, June 22. 
II. On the TESTING of MATERIALS of CONSTRUCTION, 
with some Applications to the DESIGN of MACHINERY— 
By Prof. W. C. UNWIN, M.I1.C.E., commencing on Monday, July 6. 
III. On the Teaching of ELECTRICAL ENGINEERING— 
By Prof. W. E. Ayrton, F.R.S., commencing on Monday, July 20. 
Courses II. and III., consisting of Lectures and Laboratory Instruction, 
will be illustrated by one or more DEMONSTRATIONS in the Inter. 
national INVENTIONS Exhibition. 
Each of the above Courses will extend 
Saturdays excepted. 
IV. CARRIAGE BUILDING— 
Three Lectures by G. A. Tururp, Esq., on June 29 and 30, and July 2, at 
7 p-m. 
V. PLUMBING—* 
Four Lectures, with Demonstrations, by W. R. 
6, 7, 9, and 10, at 7 p.m. 
Registered TEACHERS of the Institute may, on application to the 
Director, be admitted to any of these Courses without payment of fees. 
For further details, and for Syllabuses of the several Courses, apply at 
Gresham College, E.C., or at Exhibition Road, S.W. 
PHILIP MAGNUS, Director and Secretary. 
OPEN SCHOLARSHIPS in NATURAL 
SCIENCE of the value of £100 and £60 are awarded annually in 
OCU ruE at St. Thomas’s Hospital Medical School, Albert Embank- 
ment, S.E. 
For particulars apply to Mr. G. RENDLE, Medical Secretary. 
W. M. ORD, Dean. 
EDWARD WARD has pleasure in an- 
nouncing the issue of a new Micro-Slide of Zoophyte, with tentacles 
out, in the special manner so well known to his numerous patrons. 
da. 
over two weeks, from xo till 5 daily, 
MacutrE, Esq., on July 
Plumularia similis ... (post-free) 2 8 
Also, quite new :— 
Gorgonia verrucosa (polype stained) ,, 2 2 
Podalirus typicus (Spectre Shrimp) eS I 2 
EDWARD WARD, 249, OXFORD STREET, MANCHESTER. 
PATERSON & COOPER, 
76, LITTLE BRITAIN, LONDON, E.C. 
Electric Light and Power and Telephone Engineers, 
New Electric Light Catalogue, post free 1s. 
PATERSON & COOPER beg to give notice that they have disposed of 
the Philosophical, Educational, and Experimental Part of their Business to 
Messrs. J. and T. MAYFIELD, 41, Queen Victoria Street, E.C. 
SCIENCE AND ART DEPARTMENT 
[503 
50 PER CENT. GRANT FOR THE PURCHASE OF STANDARD 
COLLECTIONS AND APPARATUS FOR TEACHING GEOLOGY 
AND MINERALOGY. NEW LISTS and FORMS on which the 
Application is to be made supplied by 
THOMAS J. DOWNING, 
Geologist, &c., 
8, WHISKIN STREET, LONDON, E.C. (over Querter of a Century). 
INTERNATIONAL HEALTH EXHIBITION. 
DIVISION—EDUCATION. 
A PRIZE MEDAL AWARDED TO 
THOMAS D: RUSSELL, 
78, NEWGATE STREET, LONDON, E.C., 
For Geological Collections for Science Teaching. 
Catalogues Post free. 
NATURE 
[Fune 25, 1885 
LIVING SPECIMENS FOR THE MICROSCOPE. 
GOLD MEDALawarded at the FISHERIES EXHIBITION to 
THOMAS BOLTON, 57, NEWHALL STREET, BIRMINGHAM. 
who has last week sent to his subscribers Plumatella repens, with drawing 
and description. He has also sent out Leptodora hyalina, Argulus foliaceus, _ 
Argulus coregoni, Macrothrix roseus, Moina rectirostris, Lophopus crystal- 
linus, Spongilla fluviatilis, Asplanchna Ebbesbornii, Melicerta ringens, 
Volvox globator, Hydrodictyon utriculatum ; also Hydra, Vorticella, Ameba, 
Crayfish, and other Specimens for (Huxley and Martin’s) Biological Labora- 
tory work. 
Weekly Announcements will be made in this place of Organisms T. B. is 
supplying. 
Specimen Tube, One Shilling, post free. 
Twenty-six Tubesin course of Six Months for Subscription of £1 18., 
or Twelve Tubes for 10s. 6d. 
Portfolio of Drawings, Ten Parts, 1s. each. 
ICROSCOPIC OBJECTS FOR HIRE, 
Histological, Botanical, Geological, by the best Mounters. Let 
out on most moderate terms. Particulars of B. WELLS, Dalmain 
Road, Forest Hill. [302 
MINERALOGY AND GEOLOGY. 
PROFESSORS, COLLECTORS and VISITORS to LONDON are 
INVITED to INSPECT Mr. HENSON’S STOCK of CHOICE MINE- 
RALS, &c., &c. At the PRESENT TIME he has a PARTICULARLY 
FINE CRYSTALLISED NUGGET of NATIVE GOLD, WEIGHT 9 oz., 
PINK APOPHYLLITE, CHESSYLITE, EMERALDS on MATRIX, 
PYROMORPHITE (very rare FoRM), CERUSSITE, CRYSTALL- 
ISED MALACHITE, and BOTRYOIDAL CHALCEDONY, ME- 
TEORIC IRONS and STONES. POLISHED AGATES and LABRA- 
DORITES. 
A Large Series of ROCKS, also MICROSCOPIC SECTIONS of the 
same. 
Lists on Application. Hammers, Chisels, and Hammer Straps. 
PRIVATE LESSONS AND EVENING CLASSES. 
BLOWPIPE CASES AND APPARATUS. 
SAMUEL HENSON, 
277, STRAND, LONDON. 
Opposite Norfolk Street. 
SIX PRIZE MEDALS 
AWARDED FOR GEOLOGICAL COLLECTIONS. 
Geological Collections especially adapted for Teaching as supplied to Science 
and Art Department, and used by all Lecturers and Teachers in 
Great Britain, &c. x 
New and Rare Minerals constantly arriving from all parts for selection of 
Single Specimens. 
ROCK SECTIONS AND ROCK SPECIMENS: 
The Largest Variety in England. 
New Catalogues and Lists onapplication to— 
JAMES R. GREGORY, 
88, CHARLOTTE STREET, FITZROY SQUARE, LONDON 
Established 27 Years in London. 
HOW & CO.’S 
Geological Transparencies for the Lantern. 
Descriptive Catalogue on Application. 
WALKER’S SPECIFIC GRAVITY BALANCE FOR ROCKS 
AND MINERALS. 
HOW & CO.’S POCKET MICROSCOPE LAMP, 8s. 6d. _ 
MICRO-PETROLOGY.—Sections of Pitchstones, Obsidians, tsrenites, 
Syenites, Diorites, Gabbros, Dolerites, Basalts, Tachylites, ‘Trachytes, 
Andesites, Porphyrites, Rhyolites, Lavas, Ashes, Gneiss, Schists, Lime- 
stones, &c., price 15. 6d. each, 
JAMES HOw & CO., 73, Farrincpon STREET, Lonpon. 
Catalogues free. 
Copy your Circulars, Plans, Sketches, Music in attractive 
(Lithographic) Style by the 
AUTOCOPYIST. 
Black, Red, &c. From 20s. As the handwriting is faithfully 
reproduced, Circulars are more effective than by any other system: 
Ordinary pens and fluid ink used ; easily worked by alad. See it. 
The AUTOCOPYIST CO., 72, London Wall, London. 
BOOKS (Secondhand), Miscellaneous, Re- 
mainders, &.—C. HERBERT, English and Foreign Bookseller, 319. 
Goswell Road, London, E.C. Catalogue free on receipt of two stamps. 
Libraries, Old Books, and Parchment purchased. 
