PUBLISHED MONTHLY 
Science and Industry 
OFFICIAL JOURNAL OF THE 
Commonwealth Institute of Science and Industry. 
Vol. 2. APRIL, 1920. No. 4. 
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Leader say O83 oh +1 an A fer RK: 
Editorial % ssi sate ay ire 2.5 ee pce aby 
Mechanical Cotton-picker. ; Power-alcohol, 
Improvements of Mechanical Device. Research Work in Shipbuilding. 
Difficulties of Mechanical Picking. New British Standard Specifications. 
Labour in Cotton Fields. Pollution of the Atmosphere. 
Amount of Cotton Picked. . Substitutes for Leather Belting. 
Cattle Tick Dips. : Research on Non-Metallic Minerals. 
White Ant Pest. ~ ; ! Low-Temperature Carbonization. 
National Physical Laboratory: How British Industry has been Hose ey 
W. M. Holmes, M.A., B.Sc. arin as t43 of 204 
Milk and its Products. By Ewen Mackinnon, B.A., B.Sc. os We R2TSF 
Secret Inks. By ‘‘ M.” 2 bt. A 54 ce vee DOG 
Nitrogen Products: British Committee’s Report ... eats: sty oe (BS 
Rapid and Economical Methods of House Se By Clough Williams- 
Elliss ~ 4, 4s te : ee on rome Con 
Cattle Breeding in Deneck: By Lars Frederiksen at Le u, 248 
Personal. Professor Rennie, M.A., D.Sc. ia oF Py Se a 
Reviews a 4 Monet re = tty 3 9. 4200 
4 ° PER Within Commonwealth, 10s. per Ann., Post Free, 
Price 1s. COPY, Ontside Soto ealth, 11s. 6d. per Ann., Post Free. 
C.5690,—1 : ‘ 
