1823.] Neio Scientific Books. 157 



a well at Stonehouse; and that lie has been told, that in digging an- 

 other well, on the road leading from Plymouth to Cat- Down ; " parti- 

 cles of pyrites were observed by the workmen employed, and also a 

 glimpse of copper ;" but he expresses strong doubts of the accuracy of 

 this relation. 



It appears, from the following circumstance, that this subject 

 demands a more rigorous investigation : in a collection of specimens" 

 from the Plymouth limestone, recently brought to London, is an 

 assemblage of small quartz crystals, mingled with crystalline galena ; 

 upon the galena are small lenticular crystals of carbonate of iron, and 

 the amorphous mass of quartz into which the crystals pass, is mixed 

 with a greenish-grey substance not unlike chert, in which are dissemi- 

 nated minute cubes of iron pyrites. The entire specimen bears every 

 character of having once formed part of the lining of a cavity in a vein : 

 it was procured from a quarry at Cat- Down. 



Article XII. 

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Observations on the Functions of the Digestive Organs, especially 

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