NA TURE 



[May 1 1. 1905 



OPTICAL CONVENTION, 1905. 



Db. R. T. GLAZERROOK, M.A., F.R.S., 



Director of the National Physical Laboratory. 



Vice- Presiflents t 



Sir W.m df. Wiveleslie Abnev, K.C.B., D.C.L., F.R.S. 



Thk Rii-.HT Hon. The Lord Blvthswood. 



.SiK \V. H. M. Christie, K.C.B , MA., F.R.S. , 



Astrniwmer Royal. 

 E Right Hon. The Earl 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 IVorshiJi/nl Co. of Spectacle Makers. 



Sir Howard Grubb, F.R.S. 



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



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



IF Right Hon. 1 hk Earl of Rosse, K.P.. D.C.L., F.R.S. 



•HE OPTICAL CONVENTION will be held at the North- 

 ampton Institute, Clerkenwell, E.C, from May 31 to 



The object of th 

 Interested in Optical Mat 

 retical, practical, and comi 



:o bring into co-operation tho; 

 from all sides of the question, the' 



oted to papers and discussions on Optical 

 1 be collecied in a volume to he issued by the 



EXHIBITION OF OPTICAL & SCIENTIFIC INSTRUMENTS 



of Biiiish manufacture, in the large hall cf the Noilhampton 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 » ill be five 

 shillings. Applications for membership should be addressed to the 

 Hon. Sec, Mr. F. J. Selby, M.A., Elm Lodge, '1 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 GEOGRAPHICAL SOCIETY. 



The ANNIVERSARY MEETING of the Society for the ELECTION 

 of PRESIDENT and COUNCIL, &c., will be held in the THEATRE, 

 BURLINGTON GARDENS, on Mond.-iy, May 22, at 3 p m., the 

 President in the Chair. 



In place of the Annual Dinner of the Society a BANQUET in honour 

 of the retiring President, Sir Clemenis R. Markham, K.C.B, will be held on 

 the Evening of the Annivers.-try Meeting, May 22, at the Hotel Metropole, 

 Whitehall Rooms, Whitehall Place, at 7.0 p.m. f 'r 7.30. Dinner charge. 

 t.\ i.T. Friends of Fellows are admissible to the dinner as far as space will 

 permit. Applications for tickets should be made to the Chief Clerk. 

 I Savile Row, Burlington Gardens, W. 



LEONARD DARWIN,) Hon. 

 J. F. HUGHES, (Secretaries. 



r Savile Row, Burlington Gardens. W. 



THE AGENT-GENERAL for the CAPE 



OF GOOD HOPE has been instructed to receive applications f.ir 

 the vacant post of PROFESSOR OF ZOOLOGY to the SOUTH 

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



Candidates tnnst be under 35 years of age, and their applications should 

 be supported by copies of testimonials and a medical certificate. 



The salary offered is i,s°° ps' annum on appointment, i;6oo per annum 

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

 together with a merit grant of .C75 per annum alter five years, increasing 

 to .£100 after ten years. 



An allowance of .£50 will be made 

 Colony. 



The accepted Candidate is to ; 

 week in July, or so soon thereafte 



100 Vicioria Street, London, S.W., 

 May 2, 1905. 



tof the jo 



luty in Cape Town during the 

 i possible. 



UNIVERSITY COLLEGE OF NORTH 

 WALES, BANGOR. 



(A Constituent Coli.ec.e of the University ok Wales.) 



Applications are invited for the post of ASSISTANT LEG lURER IN 

 THE DAY TRAINING DEPARTMENT now vacant. Special sub- 

 jects; Elementary Science, Blackboard Drawing. Salary, .£120. 



Applications and testimonials should be received not later than Monday, 

 June 12, by the undersigned, from whom further particulars may be 

 obtained. 



JOHN EDWARD LLOYD, MA., 



May 5, 1905. Secretary and Regi-'trar. 



BIRKBECK COLLEGE 



BREAMS BUILDINGS, CHANCERY LANE, E.C. 



DAY AND EVENING COURSES. 



Chemistry 



Physics 



Mathematics 



f J. E. Mackenzie, Ph.D., D.Sc 

 (H.Wren, Ph.D., B A., B.Sc. 

 fALBERT Griffiths, D.Sc. 

 D. Owen. B.A., B.Sc. 

 1.8. W. Clack, B.Sc. 

 fE. H. Smart, M.A. 

 \ W. G. EiKT, B.A., B.Sc. 

 (A. B. Rendle, M.A., D.Sc. 



Botany t F. E. Fritsch, Ph.D., B.Sc 



Zoology - H. W. Unthank, B.A., B.Sc. 



Geology & Mineralogy .. Geo. F. Harris, F.G.S. 



Assaying, Metallurgy & Mining. Geo. Patchin, A.R.S.M. 



RESEARCH in Chemistry and Physics in well-equipped laboratories. 

 French, German, Spanish, Russian, Dutch, & Italian Classes. 



EVENING CLASSES also in Biology, Physiology, Practical Geometry, 

 Building and Machine Construction, Steam, Theoretical and Applifd 

 Mechanics, Land and Quantity Surveying, and Estimating. 



Calendar 6tl. (post free St/.), on application to the Secret.vnv. 



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, i9o4-r9o5. is £is- These Courses are recog- 

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

 lecture and laboratory instruction. The Courses are conducted by ; — 

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

 Smith: ELECTRICAL ENGINEERING, A J. Makower; 

 CHEMISTRY, J. B. Coleman, J. C. Crocker, and F. H. Lowe; 

 MATHEMATICSand 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 I2 per Session. Also 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 Princip.al 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 li-/. The Prospectuses 

 may be had at the Office for id. each. 



HIGHER MATHEMATICS 



FOR SCIENCE AND OTHER STUDENTS. 



Correspondence Tuition "8.^1:^^, l';tdr;,:d 



Royal Univnsities, in Algebra, Trigonometry, Theoretical Mechanics, Diffei- 

 ential and Integral Calculus, litre Geomelry, Geometrical Dr.awing. &c. 



Departments are at work preparing for London and Royal University 

 Examinations, Science and Art, Civil Service E.vaminations, and all Prof. 

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

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



BATTERSEA POLYTECHNIC, 



B.A.TTERSEA PARK ROAD, S.W. 



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



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



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



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



May ty. 



Lecture, 7.15 to 8.15. Lab., 8.15 to 9.45. Fee, 5J. 



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



The '• N 



" Fellowship, tenable at Cambridge 



to former science students of Newnham and Girton Colleges, 

 acant in the autumn. The holder is required to conduct 

 esearch in science during her tenure of the fellowship, wiih 

 ! to the chemical physiology of animals and plants. Appli- 

 lust be sent in by June 8 ta the Principal ok Neunham 

 . from whom further particulars may be obtained. 



For other Scholastic Advertiuments, seepage xvi. 



TYPE-WRITING UNDERTAKEN BY 



HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN- 

 TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Highi 

 Local, thorough acquaintance with Modern Languages) Kesearrl 

 Revision, Translation. Scale of charges on application. The Can 

 bridge Type-wriiing Agency, 10 Duke Street, Adelphi, W.C. 



