MODE V. GRANITE. 1 $5 



these specimens were examined by connoisseurs. 

 The late duke of Rochefoucault, a man equally 

 distinguished by his knowledge as by his virtues, 

 and who fell the innocent victim of the troubles 

 of a country for which he had made, and would 

 have yet made, the greatest sacrifices, was very 

 willing, at my entreaty, to make the most careful 

 researches after these specimens, either at the 

 King's garden, or at the Academy of Sciences, 

 of which he was a member ; but he was neither 

 able to discover them, nor any trace of what had 

 become of them. 



" The scarcity of specimens of rocks situated 

 in similar heights, and the inferences we might 

 draw from their nature in different systems of 

 geology, induces me to give a detailed descrip- 

 tion of these. 



" They are like those of 1987, granites in 

 mass, where hornblende and steatite hold the 

 place of mica, which is there extremely thinly 

 scattered; the sun and a magnifying glass are 

 necessary to enable us to perceive some white 

 and brilliant spangles; it is even doubtful if 

 these brilliant particles, which it is impossible to 

 detach, are really mica. 



" Felspar forms the dominant part of these 

 granites; constituting about three fourths of 

 their mass. Their crystals, nearly parallelopi- 



