iv Contents 



No. 6, November, 1916 



' Page. 



Brill, Harvey C. Datura alba 257 



Gana, Vicente Q. Some Philippine tanbarks 261 



Wells, Albert H. Possibilities of gulaman dagat as a substitute 



for gelatin in food 267 



Witt, J. C. The effect of sulphides on cement 273 



One plate and 1 text figure. 

 Behrman, a. S. Note on the Blacher method for the determination 



of hardness in water 291 



Reviews 295 



Index 297 



