96 Sketch of the Mineralogy^ ^c. 



to the west and north, forming an angle of perhaps 

 35° with the horizon. 



In soiix." instances this schistus is sprinkled with beau- 

 tiful spangles of golden coloured mica, which are very 

 brilliant in the sun. 



We have now made the complete circuit of the hills 

 of New-Haven, and the Academy are in possession of 

 the result of an investigation, which, from its being 

 probably the first of the kind attempted in this State, 

 may perhaps have some right to claim, as it will un- 

 doubtedly need, an indulgent reception. 



Nothing has been asserted which has not been ascer- 

 tained by actual examination ; and if there are errors, 

 they are not the result of indolent and remiss inquiry, 

 but of deficient information, or erroneous judgment.. 



If however, this imperfect investigation should prompt 

 to similar exertions throughout our state, the eifort will 

 not have been lost, and may lead to such discoveries as 

 will certainly be subservient to science, and may not im- 

 probably open new sources of domestic wealth, and ma- 

 terials for architectural and manufacturing industry. 



B. SILLIMAN. 



Yale College, Sejjt. 1, 1806. 



