8 



Four samples of fat oleo stearin, edible tallow, yellow grease, and 

 cottonseed oil were sent to the various chemists desiring to cooper- 

 ate, with a circular on the methods requesting that the titer of the 

 fatty acids prepared by the different methods of saponification be 

 taken by both methods of stirring and that the thermometer readings 

 for stem exposure be corrected by the following formula: 



T = T'+-u (T' t) .000154. 



T' = observed temperature. 



u = length of mercury column above the fat in degree divisions of the thermometer. 



t = room temperature. 



COOPERATIVE WORK. 



The reports of twenty-five chemists on the four samples of fat are 

 collected in Tables I and II. 



TABLE I. Results of cooperative work on the titer test for 1904 Wolfbauer method of 



stirring. 



Not corrected for stem exposure. 



