Eighth Pair of Nerves. OS". 



by one of the three conductors of it ; and that gentleman has 

 since related one more nearly corresponding in its result with 

 those of Dr. Wilson Philip, in which a weak power of galvanism 

 was employed. In addition to this Dr. Clarke Abel of Brighton 

 has, in his experiments, met with results in all respects similar 

 to those detailed by the latter author. 



In alluding to the above report, Mr. Broughton's candour, I 

 have no doubt, would have led him to mention Dr. Wilson 

 Philip's reply to it, which appeared in the following number of 

 the same journal, if he had been aware of that reply. 



Art. VIII. On Jasper. Bj/ Dr. Mac Culloch. 



[Communicated by the Author.] 



Although Jasper occurs in many different situations in na- 

 ture, and in almost every part of the world, it has scarcely yet ob- 

 tained a place in a geological arrangement of rocks ; its descrip- 

 tion being chiefly to be found in the works of mineralogical 

 writers, by whom it is ranked among the simple minerals. If not 

 very abundant any where, compared to the other more common 

 rocks with which it is associated, it yet forms a member of the 

 series, and cannot be omitted in an arrangement of this nature 

 without inconvenience. I need, therefore, make no apology for 

 the following imperfect remarks, which are all I have to offer 

 on a substance that has hitherto experienced unmerited neg- 

 lect ; as it occurs often under very interesting circumstances, in- 

 dependently of the recommendation contained in its beauty and 

 in its utility for ornamental works in stone. 



Our geological information respecting this rock is, in par- 

 ticular, incomplete, as it does not seem to have received much 

 attention from geologists. Mineralogists have been content to 

 consider it abstractedly from its connexions, and there is con- 

 sequently no want of descriptions of its varieties. 



As yet it does not appear to have been observed occupying 

 large spaces, or forming mountain masses. It will probably even' 

 be found that in many cases where it has been conceived to pos- 



