August io, 1905J 



NA TURE 



THE DAVY-FARADAY 

 RESEARCH LABORATORY 



ROYAL INSTITUTION. 



DIRECTOR : 

 Professor Sir JAMES DEWAR, M.A., LL.D., D.Sc, F.R.S. 

 Superintendent of the Laboratory : 

 Dr. ALEXANDER SCOTT, M.A., D.Sc, F.R.S. 

 This Laboratory was founded by Dr. Ludwig Mond, F.R.S., 

 as a Memorial of Davy and Faraday, for the purpose of pro- 

 moting, by original research, the development and extension of 

 Chemical and Physical .Science. 



Michaelmas Term. — Monday, October 2, l^ Saturday, December 16. 

 Lent Term. — Monday, January 8, to Saturday, April 7. 

 Easter Ter>n. — Mondayt April 30, to Saturday, July 21. 

 Full Information and Forms of Application can be had from the 

 Assistant Secretary, Royal Institution, Albemarle Street, \V. 



To prevent delay Candidates ou?ht to send in their applications for 

 ' ■ '1 during the course of the Term preceding that in which they wish 



ARMSTRONG COLLEGE, 



NEWCASTLE-ON-TVNE. 



Complele Courses of Instruction are provided for students of both sexes 

 proceeding to the University Degrees in Science or in Letters, and for the 

 University Diploma in Theory and Practice of Teaching. Special facilities 

 are offered for the study of Agriculture, Applied Chemistry, Mining, 

 Metal'iirgv, and all branches of Engineering. 



Matriculation and Exhibition Examinations begin September 25. 



Lectures begin October 3, iqo;. 



Prospectuses on application to F. H. Pruen, Secretary. 



COACHING '"^.^Jc^xVer" 



CHEMISTRY and PHYSIOLOGY for 



Especial Cour'^e of Instruction in THERAPEUTICS, PHARMA- 

 COLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY 

 EXAM. 



Mr. FREDERICK DAVIS, The Laboratories, 



(Registered in Column B (Aduanced Education), Teactiers Registration 



Council, Board of Education, S.W.), 



49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.G. 



GUY'S HOSPITAL. 



PRELIMINARY SCIENTIFIC (M.B. London). 

 The ne.-st Course of LECTURES and PRACTICAL CLASSES for this 

 E.\amination will begin on October 2. Full particulars may be obtained on 

 application to the Dean, Guy's Hospital, London Bridge, S.E. 



THE UNIVERSITY OF LIVERPOOL. 



FACULTY OF ENGINEERING. 



Applications are invited for the following posts :— ASSISTANT 

 LECTURER in ENGINEERING, whose duties will bi chielly in 

 connection with the subject of Surveying. Salary, ;£2oo per annum. 



ASSISTANT LECTURER and DEMONSTR.ATOR in Engineering. 

 Salary, ilioo per annum. 



Applications to be sent to the Registrar (from whom further particulars 

 may be obtained) not later than August 14. Duties to commence on 

 October z, 1905. 



P. HEBBLETHWAITE, Registrar. 



BIRKBECK COLLEGE. 



The Co 



vite applications for the appointment of ASSISTANT 

 LECTURER in M.A.THEMATICS. Commencing salary, .£175, to date 

 from September 15 next. 



Applications, stating age, degrees and qualifications, teaching experi- 

 ence, and enclosing testimonials, must reach the Principal not later than 

 August 30. 



Birkbeck College, Breams Buildings, Chancery Lane, E.C. 



Laboratory Demonstrator and Assistant 



wanted at the Northampton and County Day and Technical School 

 on September 11. Must be able to demonstrate and set up apparatus 

 in both Chemistry and Physics. Salary, ;Ctoo per annum Apply with 

 testimonials to the Secretary, The School, Abington Square, 

 Northampton. 



LONDON HOSPITAL MEDICAL 

 COLLEGE. 



(UNIVERSITY OF LONDON.) 

 SPECIAL CLASSES. 

 Special Classes for the Preliminary Scientific M.B. Examination (London) 

 will commence on October a. 



Fee for the whole Course (one year), 10 Guineas. 

 Special Cla.sses are also held for the Intern 

 Primary and Final F.R.C.S., and other Examinations. 



MUNRO SCOTT, W; 



M.B. Lond., the 



BOROUGH OF SWINDON. 

 EDUCATION COMMITTEE. 



SWINDON AND NORTH WILTS SECONDARY 



SCHOOL AND TECHNICAL INSTITUTION. 



Principal — Mr. G. H. Burkhardt, M.Sc. 



The Committee require early in September the services "f a FORM 

 MISTRESS well qualified in Biolosical Subjects, and experienced in 

 giving instruction both in Laboratory and Field. Commencing salary, 

 2^110 a year. 



Form of application, which must be retu'ned by August 25, may be had 



W. SEATON, Secretary. 

 Education Office, 



Town Hall, Swindon. 



To SCIENCE and MATHL. MASTERS.— 



REQUIRED (i) Mathematical and Science Ma: 

 School in Scotland. £150, non-res. h) Theoi 

 Science with other Subjects. ^i;o, non-res., to c 

 School near London. (3) Science and F. 

 (4) Practical Physics and Maths. £ 



the above and many oth 



for Higher Gra 

 al and Pr.act!r 



m Work. ;£r'3o, non-re 

 Idem. — For particulars 



Pow 



Tutorial Agents, 34 Bedford Street, Strand. 



For other Scholastic Adve.rtisgments^ see pa^^es cxI a}id cxliv, aho 



pa;^c ii of Supplement. 



PLATYSGOPIG LENS. 



WITH LARGER ANGLES, INCREASED FIELD, AND 

 IMPROVED DEFINITION. 



I)«P- 



AN ACHROMATIC COMBINATION. 



Combining the Definition of a Microscope with i he 

 Portability of a Pocket Lens. 



C "If you carry a small Platyscopic Pocket Lens (which every 



I observerof Nature ought to do). "—Grant Allen, in Kno-wledge. 



" I have long carried one of these instruments and found it 



Unvaluable."-JoHN T. Carrington, Editor of Science Gossip. 



The Platyscopic Lens is invaluable to botanists, mineralogists, 



or entomologists, as it focuses about three times as far from the 



object as the Coddington Lens, and has a field unequalled for 



flatness, allowing opaque objects to be examined easily. 



It is made in four degrees of power, magnifying respectively 

 10, 15, 20, and 30 diams. ; the lowest power, having the largest 

 field, is the best adapted for general use. 



Mounted in Tortoiseshell, magnifying 10, 15, 20, or 30 s. d. 

 diameters, either power ... ... ... ... .. 15 



/» Nickelised German Silver, eithet power ... ... 17 6 



Combinations of any two powers, in Tortoiseshell ... 27 6 



Ditto Ditto in Nickelised Gerjnan Silver ... 32 6 



ILLUSTRAT ED DESCRIPTION S ENT FREE. 



MANUFACTURING OPTICIAN, 



78 STRAND, LONDON, W.C. 



