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BIRKBECK COLLEGE 



(UNIVKRSITV OF LONDON) 



Day and Eveninir Courses 



for the Degrees of the University of London in the Faculty of Science, 

 and for the Geography Diploma. 



Facilities are also provided for Post-Graduate and Research Work. 

 Calendar i/-, by post 1/4. Prospectus Free. 



G. F. TROUP HORNE, Secretary. 



BiRKBECK College, E.C.4. 



OUSTLESS ROOMS 



On all Laboratonr, Library, M nseum , School, Jtc, Floors aad Linoleunta of every dcacription 



(A Regd. Nam* 



suggested by 

 FLOOR-NY«INC) 



•imFLORIGENE 



It i« IMPORTANT TO NOTE that ONE APPLICATION of " Florieen* " 



ALLAYS the DuST and DIRT for « to i« months, accordinr to traffic, aot 



only during each Sweeping (without sprinkling of any kind) but also throughout 



ail the intervening periods — which is even of greater hygienic importance. 



Th«M Mnitary n4 laNiir>Mvin| a«vanta|tt ara NOT attalaail by (WM^ni-powiara ar any atlrar nttho4. 



Send f»r PmrticHtars. Medicml Refrtt and Tettiirumutls, t* the Sole Manu/atturers : 



THE "DUST-ALLAYER" CO., 4, Vernon Place, Bloomsbury, London, W.C.1. 



Ctntra(t*rs la the A dmiraUy, H^mr OJ/See, H.M. Qffia »/ tytrks, Ccltnial Goverttments, L.C.CSrt. 



There is hardly any class of 

 Observation or Photography 



which cannot be done with the " Da von " Patent 



ICRO-TELESCOPE 



AND 



Booklet from Dept. " D "— 



F. DAVIDSON & CO. 



29 Great Portland Street, LONDON, W.l 



Scale of Charg:es for Advertising: in 

 "Science Progrress." 



Applications tor space to be made to 

 MR. H. A. COLLINS, 32, BIRDHURST ROAD, CROYDON. 



(ii) 



