PLANT 

 GROWTH-SUBSTANCES 



THEIR CHEMISTRY AND 

 APPLICATIONS, WITH SPECIAL 

 REFERENCE TO SYNTHETICS 



by 



HUGH NICOL 



Kek kezet mos (One hand washes the other) 



— Hungarian proverb 



LEONARD HILL LIMITED 



17 STRATFORD PLACE, LONDON, W.l 



ENGLAND 



1940 



