

BIRKBECK COLLEGE 



Day and Evening: 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.G. 4. 



DUSTLESS ROOMS 



On all Laboratory, Library, Museum, School, ftc. Floors and Linoleums of CTery description 



(A Regd. Nam. 



suggested by 

 FLOOR-HYSIENE.) 



iiiiFLORIGENE 



< 



It is IMPORTANT TO NOTE that ONE APPLICATION of " Florigen* " 



ALLAYS the DuST and DIRT for » to iz months, accorSmg to traffic, not 



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



all the intervenmg periods— which is even of greater hygienic importance. 



These sanitary and labour-saving advantages are NOT attained by sweeplng-iMwders or any other method. 



Sfttd for Particulars^ Medical Reports^ and Testitnoniaht to the Sole Manufacturers : 



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



Contractors to the A dTnirally, War Office, HM. Office of Works, Colonial Governments, L.C.C., 6rc 



Scale of Charges for Advertising in " Science Progress." 



Whole Pace - 

 Half Paffe 

 Quarter Rase 

 EieHth Pafire 



1 Insertion. 



£4-4 



2 5 



1 5 O 



O 14 O 



4 Insertions. 



£3 15 O each. 



2 O O H 



12 



O 12 O 



» 



ALL 

 NET. 



Applications for space to be made to Mr. H. A. COLLINS. 32. Birdhurst Road, Croydon. 



BOOKS 



on SCIEI^TIFIC, 

 TECHNICAL, 

 EDUCATIONAL, 



-^ 



I 



I 



Second-Hand at Half Prices. 

 New Books also supplied. 



MEDICAL, and 

 ALLother subjects, 

 and for all Exams. | 



Catalogues Free. State Wants. Books sent on approval. ^ 



BOOKS BOUGHT: Beet Price* Qlven. ■ 



W. & G. FOYLE, Ltd., 121-125 ChaHng Cross Rd., London, W.C.2 



J 



( it ) 



