38 (7. TJ. Sheparcts Reply to F. A. Genih. 



ricaiies in this part of tlie Pacific is hj no means unfrequent; 

 and the cases I have before quoted in tliis^ Jonrnal, are instructive 

 to navigators. The omitted notices are contained in the Appen- 

 dix to the Account of the Japan Expedition, already referred 

 to. The sketches of these storm tracks are found with others, 

 on the small chart of the North Pacific illustrating this article. 

 If these imperfect notices shall contribute, in any degree, to 

 the safety and success of our ships and commerce, it will be a 

 grateful reward for the attention and labor which this important 

 subject has at any time required. 



Nevr York, Sept. 6, 1856. 



Art. 11L~-Reply to Dr. F. A. GentKs remarks on the Minerals of 



the Canton Mine : hv Charles Upham Siiepard. 



^ The duty of affording the mineralogical reader a fair opportu- 

 nity of judging of the nature of several minerals, very cursorily 



me 



peared in this periodical. 



oeen 

 tliem, which have ap- 



Of one of these minerals, Prof. Dana observes in his Third 

 Supplement to his Mineralogy (2nd Series, vol. xxii, p. 251, Sept. 

 1856) : Oherokine^ a species as yet imperfectly described by the 

 author : crystallizes like pyromorphite, but has the color of car- 

 bonate of lead. Gr. = 4'8, Stated to contain phosphate of alu- 

 mina and zinc. [The fonn given, near to pyromorphite, would 

 suggest the improbability tliat the mineral is a phosphate of a 

 sesquioxyd with zinc, unless a pseudomorph. — j. D. Dj 



iS'ow the words of the report (p. 14,) are these. "Oherokine. 



This is another species, oefore unknown, which largely con- 

 tains oxyd of lead. It resembles white lead ore (carbonate of 

 lead) in its color, but possesses the crystalline form of pyromor- 

 phite, while it contains phosphate of alumina and oxyd of zinc, 

 and further differs from plumbo-resinite, by containing much less 

 water, and a specific gravity of only 4*8," 



But this substance has unfortunately mef with a graver mis- 

 conception from Dr. Genth, in his paper, entitled " Contributions 

 to Mineralogy" published in the last number of thi?J Journal 

 (p. 145), w*hich is the less easily accounted for from the fact, that 



"T'reatise on Mineralog}^, publislied last 

 December, contained the following (p. 407) : 



4 



" CheroJcine. In slightly acuminated hexagonal prisms, somewhat 

 drusy; botryoidal and massive. Color white, with a tinge of pink inte- 

 riorly : the outside beinn^ often sreenish or bluish-white. Lustre adaman- 



tine. 



axis. Frac- 



i-. 



