22 W. P. Headden — Kehoeite, a new Phosphate. 



bach burner" with a light-giving power of 33 

 candles, on the other side a standard candle. 

 As the candle was gradually brought nearer the 

 rotating photometer the illumination and hues of 

 the portions a and b (fig. 17) of the photometric 

 ring approached equality and when the candle was 

 at a certain distance the difference of illumination 

 and hues of a and b become indistinguishable and 

 only a band with a breadth of a+b with a uniform 

 surface was observed on the sides of the photometric 

 ring. 



The measures of the intensity of the light of the 

 Welsbach lamp in terms of the standard candle were 

 made by a friend. He made sixteen measures with 

 my Rotating-Disk Photometer and sixteen with the 

 Bunsen Photometer. 



The mean of the series of measures made with 

 the Rotating-Disk Photometer differed from the 

 mean of the departure of the maximum and mini- 

 j^ 3 mum measures from the mean by 1*49 per cent of 

 the mean intensity of the light of the Welsbach 

 lamp. 



The mean of the series of measures made with 

 the Bunsen Photometer differed from the mean of 

 Fig.18. the departure of the maximum and minimum meas- 

 ures from the mean by 5*22 per cent of the mean 

 intensity of the light of the Welsbach lamp. 



Hoboken, N. J., April 15, 1893. 



Aet. II. — Kehoeite, a new Phosphate from Galena, Law- 

 rence Co., S. D. ; by Wm. P. Headden. 



About three years ago I received a number of minerals, 

 mostly from the Merritt mine located at Galena, S. D., among 

 which was the material described in this note. The mineral 

 forms seams and bunches in the ore at one point in the mine. 

 The ore is an argentiferous galena carrying zinc blende and 

 iron pyrites. Goslarite occurs at other points in the mine but 

 was not found in the immediate vicinity of this occurrence. 

 The nearest point at which the goslarite was observed was 

 some 500 feet distant. 



The material is white, amorphous and insoluble in water, but 

 it yields a small amount of zincous oxide and phosphoric acid to 

 concentrated hydric acetate upon continued boiling. Ammonic 



