MONOGRAPHS ON THE PROGRESS OF 



RESEARCH IN HOLLAND 



DURING THE WAR 



EDITORIAL BOARD 



R. HouwiNK, Delft ; J. A. A. Ketelaar, Amsterdam 



1 . Achievements in the Field of Optics by A. BOUWERS. 



2. Technological and Physical Investigations on Natural 

 and Synthetic Rubbers by A. J. WiLDSCHUT. 



3. Contribution to the Physics of Cellulose Fibres by 

 P. H. Hermans. 



4. Modern Development of Chemotherapy by H. Veld- 

 STRA and E. HaVINGA, H. W. JuLIUS and K. C. 



Winkler. 



5. Recent Groundwater Investigation in the Netherlands 

 by W. F. J. M. KruL and F. A. LlEFRINCK. 



7. On the Effect of Gonadotropic and Sex Hormones 

 on the Gonads of Rats by S. E. DE JONGH and J. H. 

 Gaarenstroom. 



S. Investigations into Phytohormones and their Appli- 

 cations by V. J. KONINGSBERGER, H. A. VAN DER LeK 

 and H. Veldstra. 



Continued on page 147 



