NA TURE 



[May 1 8, 1905 



OPTICAL CONVENTION, 1905. 



Vri'sident: 

 Dr. R. T. GLAZEBROOK, M.A., F.R.S., 



Director of the National Physical Laboratory. 



Vice-Presidents: 



Sir Wm. de Wiveleslie Abney, K.C.B., D.C.L., F.R.S. 



The Right Hon. The Lord Blythswood. 



Sir W. H. M. Christie, K.C.B , MA., F.R.S., 



Astroiwwer Royal. 

 The Right Hon. The Eael of Crawford, K.T., LL.D., F.R S. 

 Mr. Thos. R. Dallmeyer, F.R.A.S. 

 The Hon. Alban G. H. Gibbs, M.A., M.P., 



Master 0/ the Worshipful Co. of Spectacle Makers. 



Sir Howard Grubb, F.R.S. 



The Right Hon. The Lord Kelvin, O.M., G.C.V.O., F.R.S. 



The Right Hon. The Lord Rayieigh, O.M., D.C.L., F.R.S. 



The Right Hon. The Earl of Rosse, K.P., D.C.L., F.R.S. 



•HE OPTICAL CONVENTION will be held at the North- 

 on Institute, Clerkenwell, E.G., from May 31 to 



June 3, inclus 



The object of the Con\ 

 interested in Optical Ma 

 retical, practical, and con 



The mornings will be devoted to papers and discussions on Optical 

 subjects. These will be collected in a Yolume to be issued by the 



ion is to bring into co-operation those 

 s, from all sides of the question, theo- 



Convention. 

 The 



EXHIBITIONOF OPTICAL & SCIENTIFIC INSTRUMENTS 



of Eritish nLinufacture, in the large hall of ihe Northampton Institute, 

 during the Convention, open daily from 12 to 10 p.m. In connection 

 with this, a catalogue is in preparation, which will be a useful work 

 of reference in regard to instruments manufactured in this country. 



The Subscription for Membership of the Convention will be five 

 shillings. Applications for membership should be addressed to the 

 Hon. Sec, Mr. F. J. Selby, M.A., Elm Lodge, 'I eddington, 

 Middlesex, who will be glad to furnish further particulars if desired. 



ADMISSION to the Exhibition, daily, ONE SHILLING, 

 after 7 p.m.. Sixpence. 



Tickets admitting to the Exhibition at any time while it is open, 2/6. 



ROYAL INSTITUTION OF 

 GREAT BRITAIN. 



ALBEMARLE STREET, PICCADILLY, W. 



SATURD.W, .May 20, at Three o'clock, James George Frazer, Esq., 

 D.C.L., LL.D., Litt.D. First of Two Lectures on "The Evolution of 

 the Kingship in Early Society." Haifa-Guinea the Course. 



TUESDAY, May 23, at Five o'clock, the Rev. Henry G. Woods, D.D., 

 of the Temple. First of Three Lectures on "Velazquez." 



HalfaGu 



THURSDAY, May 25, at 

 D.Sc, F.R.S. First of Th: 

 Half-a Guinea. 



e o'clock. Professor J. A. Fleming, M.A., 

 Lectures on "Electromagnetic Waves." 



BATTERSEA POLYTECHNIC, 



BATTERSEA PARK ROAD, S.\V. 



Principal-SIDNEY H. WELLS, Wh.Sc, A.M.I. C.E., A.M.I.M.E. 



A special SUMMER COURSE of Eight Lectures, followed by Labora- 

 tory Work in GAS ANALYSIS, will be held by Mr. J. Wilson, M.Sc. 

 (Head of Chemical Department), on Wednesday Evenings, commencing 

 May 17. 



Lecture, 7.15 to 8.15. Lab., 8.15 109.45. Fee, 55. 



For other special courses for Int. and Final B.Sc, see prospectus. 



LINNEAN SOCIETY OF LONDON. 



Notice is hereby given that Ihe Anni- 

 <ooms of the Society, Burlington Hous 



■sary Meeting will be held at the 

 on Wednesday, May 24, 1905, at 



B. DAYDON JACKSON, General Secretary. 



BIRKBECK COLLEGE, 



BREAMS BUILDINGS, CHANCERY LANE, E.C. 



HISTORV OF CHEMISTRY. 



-A Course of Nine Lectures will be given by Di. J. E. Mackenzie 

 Saturdays, commencing May 27, at 12 noon. 

 Fee for the Course, 5^. 



adapted for this purpose 

 Full particulars at the In 



NORTHERN POLYTECHNIC 

 INSTITUTE, 



HOLLOWAY, LONDON, N. 



(Close to Holloway Stn., G.N.R., and Highbury Stn., N.L.R.) 



LONDON UNIVERSITY SCIENCE AND ENGINEERING 



DEGREES. 

 Day and Evening Courses in the above under recognised teachers in — 



MATHEMATICS, 



PHYSICS, 



CHEMISTRY, 



ENGINEERING. 



Separate Laboratories for Elementary, Advanced and Honours students, 

 exceptionally large and well equipped. 



RESEARCH. 



Accommo-laiion and apparatus provided for research in either Pure or 

 Applied Chemistry and Physics, and Engineering, in rooms specially 



r sent on receipt of postcard. 

 REG. S. CLAY, D.Sc, Principal. 



At the SOUTH-WESTERN POLYTECHNIC, 



Manresa Road, Chelsea, S.W., Day College Courses of thirty hours 

 per week are conducted in preparation for the London University 

 Degrees of B.Sc. in Mechanical and Electrical Engineering, in Chemis- 

 try, Physics and the Natural Sciences. The composition fee for the 

 Session of three terms, 1904-1905, is ;£i5. These Courses are recog- 

 nised for "Internal Students" of the University, and consist of 

 lecture and laboratory insiruction. The Cr.urses are conducted by :— 

 MECHANICAL ENGINEERING, W. W. F. Pullen, A. Macklow 

 Smith; ELECTRICAI. ENGINEERING, A J. Makower ; 

 CHRMISTRY, J. B. Coleman, J. C l_rocker, and F. H. Lowe; 

 MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lister 

 and L. Lownds; BOTANY, H. B. Lacey and T. G. Hill; 

 GEOLOGY, A J. Maslen. In the evenings similar Courses will be 

 conducted, but at £2 per Session. AKo TECHNICAL DAY 

 COURSES of three years' duration are arranged as a preparation for 

 the Engineering, Electrical and Chemical and Metallurgical pro- 

 fessions. The Laboratories and Workshop are open for RESEARCH 

 under the direction of The Principal and the Heads of Departments. 



Further particulars may be obtained on application to The 

 Secretary, who will send either the Day College Prospectus and 

 Calendar or the Evening Class Prospectus for i\d. The Prospectuses 

 m.iy be had at the Office for \d. each. 



COACHING '"?l?c7.ctr 



In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for 

 MEDICAL EXAMS. 



Especial Course of Inst. notion in THERAPEUTICS, PHARMA- 

 COLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY 

 EXAM. 



Mr. FREDERICK DAVIS, The Laboratories, 



(Registered in Column B {Advanced Education). Teachers Registration 



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



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



THE AGENT-GENERAL for the CAPE 



OF GOOD HOPE has been instructed to receive applications fir 

 the vacant post of PROFESSOR OF ZOOLOGY to the SOUTH 

 AFRICAN COLLEGE, CAPE TOWN, up to June i next. 



Candidates iitnst be under 3'; years of age, and their applications should 

 be supported by copies of testimonials and a medical certificate. 



The salary offered is /500 per annum on appointment, £too per annum 

 after three years' service, £,700 per annum after ten years' service, 

 together with a merit grant of £-j^ per annum after five years, increasing 

 to Itao after ten years. 



.An allowance of /iso will be made to cover the cost of the journey to the 

 Colony. 



The accepted Candidate is to assume duty in Cape Town during the first 

 week in July, or so soon thereafter as possible. 



100 Victoria Street, London, S.W., 

 May 2. 1905. 



TO SCIENCE MASTERS, especially those 



taking ELECTRICITY a:; a special subject. Wanted by July i next 

 for important College, well-qualified Master for Electricity. One who 

 has had some experience in the organisation of the work of a local 

 Technical Instruction Committee. Salary, ;ti5o to j^2oo per annum. 

 Candidates for the above and those seeking posts for the term com- 

 mencing in September next ^hould apply forthwith, giving details as 

 to qualifications and enclosing copies of testimonials, to Griffiths, 

 Smith, Poweli. & Smith. School Agents (Estd. 1833), 34 Bedford 

 Street, Strand. London. 



Scientific Assistant and Mechanician re- 

 quires responsible and p'osressive appointment (works or privat-r). 

 Mpntioned in original research, Chem. and Physics. Highest rcf^. 

 — Apply "Assistant," c/o Nj^ture. 



