Eupyrchroite of Crown Point, 331 



vesces slightly, carbonic acid gas escaping. The quantity 

 of this gas was accurately determined by the proper appara- 

 tus. In preparing the mineral for proportional analysis, each 

 fragment was carefully examined with the lens, to ascertain 

 that it was free from accidental mixture with other minerals. 

 It was reduced to impalpable powder by levigation, and dried 

 at 212° F., and weighed while still warm. A sample of the 

 mineral in coarse powder was used in the determination of 

 the water contained in it. In the other steps of the analysis 

 the methods as given by Rose were pursued, and the follow- 

 ing results were obtained. 



Fluorine, . 0-599 



Calcium, . 0-856 



Protoxide of iron, 2-000 



Water, . 0500 



100-000 



The fluorine as usual was expelled, and thus determined 

 by difference, in the re-formation of phosphate of lime, after 

 decomposition of the precipitated mixed phosphate of lime 

 and fluoride of calcium, and its equivalent of calcium was 

 deducted from the lime obtained as a sulphate of lime. — The 

 American Journal of Science and Arts, vol. xii., 2d series, No, 

 34, p. 73. 



On the Aboriginal Tribes of India. By Major-General John 

 Briggs, F.R.S., Vice-President of the Ethnological Society 

 of London . 



On the occasion of the meeting of the British Association 

 at Oxford, I was pressed to read a paper on the aboriginal 

 tribes of India. At that period my inquiries were incomplete, 

 and I was unable to trace them to any separate stock, though 

 it appeared clear they were in almost every respect distinct 

 from the mass of the population, consisting of Hindus of the 

 Bramanical persuasion. Since that period I have extended 

 my researches, and have given two or three lectures on the 

 same subject at the meetings of the Ethnological Society in 

 London. 



