JS'6 Werverian Natural History Society. 



C. also recommends the-having the plates moveable instead 

 of being soldered together, as' the trough can be much easier 

 cleared out after using it. He recommends to make the 

 troughs of glass or Wedgwood's ware^ in preference to the 

 materials hitherto employed. 



WERNEIUAN NATURAL HISTORY SOCIETY. 



At the meeting of the Wernerian Natural History So- 

 ciety, 1st August, Dr. James Ogilby of Dublin read a very 

 interesting account of the mineralogy of East Lothian, which 

 appeared to have been drawn up from a series of observa- 

 tions, made with great sjkill. and was illustrated by a suite 

 of 350 specimens laid upon the table. As the county is in 

 general deeply covered with soil, and profusely clothed with 

 vegetables, the determination of the different formations 

 must have been a work of considerable labour; and the 

 skill, judgement and perseverance of the observer must have, 

 been frequently put to the trial. The doctor, after describ- 

 ing the physiognomy or external aspect of the county, gave 

 a particular account of the different formations of which it 

 is composed. They are as follows:- — Transition; Indepen- 

 dent Coal ; Newest Floelztrap : and Alluvial. When de- 

 scribing the different transition rocks, he alluded particular- 

 ly to the supposed granite of Fassnet, (described by profes- 

 sor Play fair in his illustrations of the Huttonian theory,) 

 which he proved to be a stratified bed of transition green- 

 stone. The description of the rocks of the newest floelz- 

 trap -formation was particularly interesting, not only on ac- 

 count of the beautiful transitions he pointed out, but also 

 as it proved the existence of a considerable tract of these 

 rocks in Scotland, where their occurrence had been disput* 

 ed. He enumerated and described the following members 

 of this formation: — trap-tuff; amygdaloid : clay-stone; ba- 

 salt; porphyry-slate; and porphyry-slate inclining to green- 

 stone. He found the trap-tuff, which is a coarse mechani- 

 cal deposite, forming the lowest member of the series, and 

 resting immediately on the coal-formation: on this tuff 

 rests amygdaloid containing fragments : above this amyg- 

 daloid is common amygdaloid free of fragments ; this, in 



its. 



