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New 



TO CORRESPONDENTS. 



We are ot 



room, a paper by Prof. Olmsted, describing a series of very beautiful experiments 

 on the colors of the solar spectrum, first performed by Mr. Forrest Shepherd. 

 The communication will appear in our next number. 



Papers, " on the analysis of the Coprolites of Birds," by Dr. S. L. Dana, and " Ob- 

 servations upon the Valley of the Jordan and the Dead Sea," by Mr. J. D. Sher- 

 wood, will have an insertion in the January No. ; and also communications from 

 Prof. Strong, Prof. Bailey, Mr. J. D. Dana, and Prof. Dewey. 



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Authors should always specify at the head of their MSS. the number of extra 

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