June 17, 1892.] 



SCIENCE, 



349 



day in a specially rich field for study in geology and botany, and 

 -where entomology was not lacking in opportunity. Those who 

 were compelled to return took the afternoon trains, and a few 

 who could remain assembled and took tea at the home of the 

 president, where they spent the evening. The meeting broke up 

 •with the conviction that the first summer gathering of the young 

 Academy had been a pleasant and successful occasion. 



— In a paper read before the Washington Chemical Society, 

 May 13. the carbohydrates of the coffee-berry were discussed by 

 Erwin E Ewell. Our knowledge of the carbohydrates has been 

 materially extended during -very recent years, in consequence of 

 "which investigation in this line has been greatly stimulated. Max- 

 well has demonstrated the presence of an insoluble, galactose-yield- 

 ing carbohydrate; Reiss has reported an insoluble carbohydrate 

 that yields mannose by hydroysis with dilute sulphuric acid. The 

 water-soluble carbohydrates have received less attention ; indefinite 

 statements concerning sugar, gum. and dextrin make up the ex^ 



isting literature of the subject. By experiments made in the 

 laboratory of the United States Department of Agriculture, cane- 

 sugar, accompanied by small percentages of a substance resembling 

 dextrin and some reducing sugar, has been shown to make up the 

 water-soluble carbohydrate material of coffee. The cane-sugar 

 was obtained in pure and well-defined crystals. A gum was pre- 

 pared from the portion insoluble in water. The latter has been 

 shown to be a galactose and pentose-yielding substance, and is now 

 being studied farther. At the same meeting, K. P. McElroy and 

 W. D. Bigelow described a new method for the qualitative sepa- 

 ration of calcium and strontium, based on the solubility of calcium 

 chromate in dilute acetone. The chlorides of these metals are dis- 

 solved in 50 per cent acetone, and a solution of potassium chromate 

 in 50 per cent acetone added. After standing ten minutes no 

 strontium can be detected in the filtrate, and the precipitate is 

 practically free from calcium salts. These investigations will be 

 continued with the hope that the separation may prove quantita- 

 tive. 



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