294 



Society Proceedings (122). 



acetic acid shows a decrease in these experiments, while the /3- 

 hydroxybutyric acid only fails to show the "expected increase" 

 seems to be in accordance with this view. 



The experiment shows that glucose is absorbed rapidly by 

 rectum, and is taken into the blood in sufficient quantities to 

 decrease the excretion of acetone produced by a diet high in fat. 



131 (1878) 



Effect of dilution on the precipitation reaction for syphilis 

 proposed by author. 



By R. L. KAHN. 



[From Bureau of Laboratories, Michigan Department of Health, 

 Lansing, Michigan.] 



One of the important differences between the precipitation 

 reactions of Meinicke, Sachs and Georgi, Dryer and Ward and 

 that proposed by the author 1 - 2 is that in the last reaction, the 

 amount of normal salt solution is reduced to a minimum. It 

 was early observed, when adding given amounts of serum and 

 antigen to a series of tubes and subsequently adding increasing 

 amounts of normal salt solution to that series, that the degree of 



Table showing Delaying Effect of Physiological Salt Solution on Precipi- 

 tation Reaction for Syphilis Proposed by Author. 





Tube No. 



1 



2 



3 



4 



5 



6 



Syphilitic serum, 

















0.1 



0.1 



0.1 



0.1 



0.1 



0.1 





0.025 



0.025 



0.025 



0.025 



0.025 



0.025 



Salt solution, c.c. . 





0.1 



0.2 



0.4 



0.6 



0.8 



Results after i hour 















incubation in 

















Marked 



Moderate 



Doubtful 











Precipi- 



Precipi- 



Precipi- 



Negative. 



Negative. 



Negative. 





tation. 



tation. 



tation. 









1 Proc. Soc. Exper. Biol, and Med., 1922, xix, 182. The preparation of 



antigen is briefly described in this paper. It should be cholesterinized to 0.4 per 

 cent, before diluting with salt solution. 



1 Arch. Derm, and Syphil., 1922, v. 



