x ‘NATURE 
* [May 14, 1885 
THE OWENS COLLEGE, 
MANCHESTER. 
The PROFESSORSHIP of PURE MATHEMATICS will become 
vacant, through the resignation of Prof. BARKER, at the end of the 
current Session. 
Candidates for the Chair are invited to forward Applications and Testi- 
monials addressed to the Council of the College, under cover to the 
REcisTRAR, not later than MONDAY, June 1 next. 
Information concerning the Terms and Conditions of the Appointment 
will be forwarded on application to J. G. GREENwoop, LL.D., Principal 
of the College. 
HENRY WM. HOLDER, M.A., Re strar: 
THE OWENS COLLEGE, 
MANCHESTER. 
The PROFESSORSHIP of ANATOMY has become Vacant through 
the death of Prof. Morrison Watson. 
Candidates for the Chair are invited to forward Applications and 
Testimonials addressed to the Council of the College, under cover to the 
ReGIsTRAR, not later than MONDAY, June rz next. 
The Professor will be expected to enter upon his duties on October 1 
next. 
Information concerning the Terms and Conditions of the Appointment will 
be forwarded on Application to J. G.GrREENWwoop, LL.D., Principal of the 
College. 
HENRY WM. HOLDER, M.A.,, Registrar. 
THE YORKSHIRE COLLEGE, LEEDS. 
The Cavendish Professorship of Physics will become Vacant by the resig- 
nation of Prof. Ricker, M.A., F.R.S., on SEPTEMBER 30 next. 
Stipend, £300, with two-thirds of the Fees. Candidates are invited to for- 
ward Applications and Testimonials not later than JUNE 1. 
Further information will be supplied on application to the SECRETARY. 
ART SCHOOL FOR LADIES. OPEN DAILY. 
BEDFORD COLLEGE, LONDON, 
8 anD 9, YorK PLace, BAKER STREET W. 
Art Visiror—EDWIN LONG, R.A. 
ProFEsSOR—NORMAN TAYLER, A.R.W.S. 
AssISTANT-TEACHER—Miss M. A. HEATH. 
A Special Class for painting from the DRAPED LIVING MODEL 
meets on MONDAYS, WEDNESDAYS, and FRIDAYS. For Particulars, 
apply to the SECRETARY, 
B. SHADWELL, Hon. Sec. 
ROYAL INSTITUTION OF GREAT 
BRITAIN. 
ALBEMARLE STREET, PICCADILLY, W. 
SATURDAY next (May 16) at Three o'clock: PROF. WILLIAM 
ODLING, M.A., F.R.S., First of Two Lectures on ‘‘OrGaNtc SEpPTics 
AND AnTisEpTics.” Half a Guinea the Course. 
THURSDAY (May 21), at three o'clock: PROF. C. MEYMOTT 
TIDY,M.B., F.C.S., First of Three Lectures on ‘‘ Potsons In RELATION 
TO THEIR CHEMICAL CONSTITUTION AND TO VITAL Functions.” Half a 
Guinea. : : 
Subscription to all the Courses in the Season, Two Guineas. 
ASTRONOMICAL REFLECTING TELE- 
SCOPE, 6} inches diameter, on Altazimuth Stand, with Solar Eyepiece, 
a Battery of 6 Huyghenian and Achromatic Eyepieces and Terrestrial 
Eyepiece, with other accessories. Price £35. Cost upwards of £50.— 
Apply to Mr. JoHn Brown1nG, 63, Strand, W.C. 
SCIENTIFIC BOOKS.—Speciality, Micro- 
scopy and the Allied Sciences, Natural History, &c., &c. Secondhand 
and New. Catalogue forwarded on receipt of two stamps. Scientific 
Libraries and small parcels of Books purchased for immediate Cash. 
W. P. COLLINS, 157, Great Portland Street, London, W. 
NOTICE OF REMOVAL. 
Prof. P. MARTIN DUNCAN, F-.R.S., has removed to 6, Grosvenor 
Road, Gunnersbury, Middlesex. 
BEST BLACK INK KNOWN. 
DRAPER’S INK (DICHROIC). 
DIFFERING FROM AN. THING ELSE EVER PRODUCED. 
Writing becomes a pleasure when this Ink is used. It has been adopted 
by the principal Banks, Public + Eccyane Railway Companies throughout 
reland. 
It writes almostinstantly Full Black. | Flows easily from the Pen. 
Does not corrode Steel Pens Blotting-paper may be applied atthe 
Iscleanly to use, and not liable to Blot. moment of writing. i 
Can »e btained in London, through Messrs. BAkcLay & Sons, Farring- 
don Street; W. Epwarps, Id Change; F. Newpery & Sons, Newgate 
Street ; J. Austin & Co., Duke Street, Liverpool ; and to be had of al 
Stationers. 
BEWLEY & RAPER (Limited), Dublin. 
LIVING SPECIMENS FOR THE MICROSCOPE. 
GOLD MEDAL awarded at the FISHERIES EXHIBITION to 
THOMAS BOLTON, 57, NEWHALL STREET, BIRMINGHAM. 
who has last week sent to his subscribers Phalansterium digitatum (new to 
Great Britain), with drawing and description. He has also sent out Lophopus 
crystallinus, Floscularia cornuta, Melicerta ringens, Notommata parasita, 
Uroglena volvox, Rhinops vitrea, Argulus foliaceus, Peridinium tabulatum, 
Volvox globator (golden stage), Spirogyra (in conjugation); also Hydra, 
Ameeba, Crayfish, Edible Frog, Crassicornis, and other Specimens for (Huxley 
and Martin’s) Biological Laboratory 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 18.5 
or Twelve Tubes for 10s. 6d. 
Portfolio of Drawings, Ten Parts, 1s. each. 
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. 
ay 
(post-free) 2 8 
Plumularia similis... «. 
Also, quite new :— 
Gorgonia verrucosa (polype stained) ,, 2a 
Podalirus typicus (Spectre Shrimp) 5 I 2 
EDWARD WARD, 249, OXFORD STREET, MANCHESTER? 
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. 
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 on application to— 
JAMES R. GREGORY, 
88, CHARLOTTE STREET, FITZROY SQUARE, LONDON. 
Established 27 Years in London. 
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 
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., 
38, WHISKIN STREET, LONDON, E.C. (over Quarter of a Century) 
Cc. D. AHRENS, 
PRISM WORKER AND PRACTICAL OPTICIAN, 
36, GREAT RUSSELL STREET, LONDON, W.C. 
SPECIAL NOTICE—See the New Polarising Prism. 
Can be used over any A & B Eyepiece. Strongly recommended for Lantern 
Work; will take in any Object. Also see the New Erecting Microscope. 
Any Object-Glass and any Eyepiece can be used withit. Itis the only way 
of seeing the Objects in their right shape and form. Maker of the Largest 
Nicol Prisms in existence for the Late W. Spottiswoode, Esq., P.R.S., &c., 
&c., and for Frank Crisp, Esq., LL.B., B.A., &c., &c 
TRADE SUPPLIED WITH PRISMS. 
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. 6¢. _ 
MICRO-PETROLOGY.—Sections of Pitchstones, Obsidians, Granites, 
Syenites, Diorites, Gabbros, Dolerites, Basalts, Tachylites, ‘Trachytes, 
Andesites, Porphyrites, Rhyolites, Lavas, Ashes, Gneiss, Schists, Lim: - 
stones, &c., price 1s. 6d. each, 
JAMES HOw & CO., 73, FARRINGDON STREET, Lonpon. 
