October 26, 1905 J 



NA TURE 



ccliii 



Correspondence Tuition ''^ '"'^''''^ '*"'"'''='' «"''" 



Roy^il Univ- isiiici, in Algebra. Trigoni 



HIGHER MATHEMATICS 



FOR SCIENCE AND OTHER STUDENTS. 



' "f 



ford, Cambridge, London and 

 y,Theorecical Mechanics, Diffei- 

 d Integral Calculus, Pure Geometry, Geometrical Drawing. &c. 

 Departments are at work prep-iring for London and Royal University 

 Examinations, Science and Art, Civil Service Examinations and all Prnf. 

 Preliminaries —Apply to Mr. J. Charleston, H.A., Burlington Corre- 

 spondence College, Clapham Common. London, S.W. 



HARTLEY UNIVERSITY COLLEGE, 

 SOUTHAMPTON. 



Principal — S. W. Richardson, D.Sc. (Lond.). 



Applications are invited for the Appointment of ASSISTANT LEC- 

 TURER and DEMONSTRATOR in CHEMISTRY. 



Applications, giving particulars of age, training, qualifications and ex- 

 perience, with copies of three recent testimonials, must be sent to the 

 Principal on or before November 4. 



Further particulars may be obta 



applic 



the Re 



TO SCIENCE AND MATHEMATICAL 



MASTERS. — Required in January, (i) Science and M.iths. Must 

 take charge of games. Salary, ^^150, non-res. Grammar School. 

 (2) Graduate for Science, Maths, and Drawing. itio, non-res. 

 (:!) Maths, and French, liio, non-res. (4) Chemistry and Physics. 

 ;^I20, non-res. — For particulars of the above, address Griffiths, 

 S.MITH, Powell & Smith, Tutorial Agents (Estd. 1831), 34 Bedford 

 Street, Strand, London. Immediate notice of all the best vacancies 

 for Science and Mathl. Masters will be sent. 



THE UNIVERSITY OF LEEDS. 



DEPARIMENT OF ELECTRICAL ENGINEERING. 



The Council of the University invite applications for the appointment of 

 ASSISTANT LECTURER and DEMONSTRATOR in ELEC TRICAL 

 ENGINEERING to be made up to November rS. Salary, £175 a year. 

 Further particulars may be obtained from the Registrar. 



Laboratory Assistant and Attendant, com- 

 petent to carry out simple Physical Determinations under direction, 

 wanted at the Lowestoft Laboratory of tUe Marine Biological .Associa- 

 tion of the United Kingdom. Full particulars on application to the 

 Naturalist in Charc.e, Marine Laboratory, Lowestoft. 



FOR SALE. — 52 milligrams of fairly pure 



Radium Bromide. Offers wanted to wind up an estate.— Apply Wild 

 AND Collins, 31 Lawrence Lane, Cheapside, London. 



NEW BOOKS AT SECOND-HAND PRICES. 



Free on Application.-H. J. GLAISHERS COMPLETE CATALOGUE 

 of Publisher's Remainders, comprising works in all Branches of Literature 



(including the various Departments of Science). 



ez'ery attention. 



57 Wigmore Street, London, W. 



TO SECRETARIES OF LECTURE SOCIETIES 

 AND OTHERS. 



A Set of LANTERN SLIDES illustrating the beautiful and 

 historic resort of Hastings and St. Leonards and neighbourhood, 

 together with a typed lecture, are now ready and can be had on 

 loan gratis by application to CHARLES A. THARLE, Honorary 

 Secretary. Hastings and St. Leonards Borough Association. 

 APPLY EARLY FOR VACANT DATES. 



ncros 



iCOpEC 



tor the immediate preparation 

 oj- small quantities of fresh, 

 active staining" solutions. 

 They save time and trouble, 

 and are free trom the dis- 

 advantages associated with 

 stock solutions. 

 Economical and efficient. 



/;; liii'cs of 6 



Of all chemists 



Full list and further iiarticiilars on request 



Burroughs Wellcome and Co. 



LONDON, SYDNEY and CAPE TOWN 



[COIYRICHT] XX 32 



200 Milligrams of 



in Stock in /^Ss"^ ^ .. „„_ ___ 



i, '^'-^^-^ulP 1.800,000 



mg. tubes ^^^^ "nits strength. 



17/6 per lb. bar. 



or 4 oz. 6;- 



SECOND-HAND TELESCOPES. 



4l-in. Cooke Kqu.iorial, with e.vlra Aliazimuih Mount, £60. 4-in 

 Wray, slow Moiions complete, £30. 4-in. Wray 0.din.iry, £25. 

 Si-in. Browning Reflertor, £15. 6tin. Calver Rellector, £12. 6A-iii. 

 Calver Equatorial. £15. vin. Student Steward, £4 10s. 5-in 

 Student Solomon, £2 15s. and £3 lOs. 



SECOND-HAND MICROSCOPES. 



Watson's tdinlmrch Student, complete with fittings, £15. Swlft's 

 Bacteriological, £15. Beck's "London," complete, £8 lOs. Micro- 

 scope^ from 20s. upwards to suit all students. 

 .l/,i«l' otlu-i-s. all /ci:i,is. Lists on Apftication. 



A^. cr..A.xs.is:so]v sc co., 



23 BARTLETT'S BUILDINGS, HOLBORN CIRCUS, LONDON. 



Beautiful show crystals, in lumps of 2 oz. upwards, 2- per oz. 

 Pitchblende, from 2/- to 30/- per piece ; in Powder, 2/6 per 02. 

 Kunzite, seleLted. 2/- per gramme. Carnotite, 2/- per oz. 



Aeschynit, 2/- per oz. Emanium, 30/- per decigramme. 

 Sparteite (see Nature, March 31. 1904, page 52^,), 2/- per piece. 

 Chlorophane, II- per piece. Samarskite, 2/- per oz. 

 Zinc Sulphide, green and yellow. 5/- per tube. 2/6 half tube. 

 Rad. Residue, 2- per tube. Polonium, 21/- per gram ; 11/-it-gram. 

 Flexible Sandstone, 5/- to 50/-. (See N.\ture, June 2], 1904, 



pace I ^s) Radio-active Mud, 1/6 per bottle. 

 Monazit, 3/- ptr o/. Monazit Sand, 1/- per oz. 

 Diamond chips and pouder, 10- per caiat (best quality). 



Euklas, Hiddenit, Wagnerit, Phosgenit, &c., &c. 



Bar. Plat. Cyan., for Screens, 3/- gramme, 60/- oz. Crystals, 4/- 



grainme. Screens, 9d. per square inch. 

 Radio-active screens, 6d. per square inch. Willemite 

 screens, 6d. pirr Mjuare inch. Electroscope (special), 21/- 

 Spinthariscopes (special), IS/-, 10/6 and 7/6. 

 Selection of Minerals in boxes, 2 6, 5 6, 10/6 and 21/-. 

 New Zealand Vegetable Caterpillar, with a stem showing 

 Iructification growing out of its head, 10,6 to 21/- each. 

 (See Nature, May 12, 1904, page 44.) 

 All Post Free within U.K. 

 Cocis may be returned if not apfrovcJ of, -.<jheu money mil/ be refunded. 

 Fro/essional Men, Universities, Schools, i-'c., allozvcd sfedat terms. 



ARMBRECHT, NELSON & CO., 



71 & 73 DUKE ST., CROSVENOR SQ., LONDON, W. 



