2^6 Observations on Mr Bendanfs 



large mass or rock of rhomb spar in Middlefield, which 

 contains fibrous tremolite. The magnesian carb. ofhme in 

 Middlefield, contains dark colored veins of the same sub- 

 stance, in which is imbedded Hepatic sulph. of iron? which 

 on being moistened with sulphuric acid gives off sulph. hy- 

 drogen in large quantities. 



Agate, one large specimen which I found near Chester 

 village, in the sand, weighed upwards of 180 lbs. after seve- 

 ral large fragments were broken off. It consists of yellow 

 jasper and chalcedony. A large mass of chalcedony and 

 jasper which is in part agatized, I have since seen not far 

 from the meeting house, almost twice as large as the one 

 found at the village. 



Art. YW. -^Observations on Mr. Beudanfs Geological Tra- 

 vels in Hungary,* &/-C. with miscellaneous remarks on coal, 

 Sfc-, by William Maclnre, Esq., President of the American 

 Geological Society, in a letter to the Editor, dated Mad- 

 rid, Aug. 20, 1822. 



This whole work is a specimen of book making. All 

 that possibly can be useful, in mineralogy or geology, might, 

 with much ease, have been put into 50 pages, and the reader 

 saved the labor of turning over from 1500 to 1800 pages of 

 repetitions and descriptions of the same rocks, a thousand 

 times over, creating confusion and fatigue, without leaving 

 in the mind, any defined ideas of the subject. The author 

 seems totally unacquainted with the immense variety of 

 volcanic rocks, where age has made still more diversity and 

 complication in their structure, as is the case with what he 

 calls his trachite, or what Werner calls, the newest floetz 

 trap. It would be easy for any one who had Sufficient pa- 

 tience to describe every Lava that has been thrown out of 

 Vesuvius, to fill three quarto volumes by only walking three 

 or four leagues in the vicinity of the mountain, or of any 

 other mountain produced by fire. 



* The maps were so awkwarkly placed in the atlas that they coukl not 

 be opened without tearing^ them, which rendered it necessary to put theia 

 on canvass to preserve them. 



