SCIENCE-ADVERTISEMENTS 



ANNOUNCIS^G 



A New Surface Tension Apparatus 



Desig'ned by Dr. P. L. du Nouy, with the Carrel Mission (French) 

 Sit the Rockefeller Institute for Medical Research 



Developed by Our Engineering DepArtment with his Co-operation 

 and Built by Our instrument Shop 



SPECIAL FEATURES 



1. Extreme Rapidity of Measurements ( 15-20 seconds) . 



2. Small Quantity of Substance Required (1 cc. ) . 



3. Accuracy and Reliability of Determinations. 



4. Simplicity of Technique. 



5. Reliability for Use with Colloidal Substances. 



6. Direct Reading. No Complicated Formulas or Calculations. 



7. Readily Standardized and Calibrated. 



8. Ruggedness and Freedom from Defects Occasioned by Continuous Use. 



For method of use see The Journal of General Physiology, May 20, 1919, Vol. I, No. 5. 



A Bulletin (No. S2S) is now in preparation containing full description and directions for use, 

 prepared in co-operation with Dr. du Nouy. 



Price will be announced later. 



Central Scientific Company 



CHICAGO 



460 East Ohio Street 



U. S. A. 



