80 



Oxide of Lead, Lime, Silica, and a metallic substance 

 differing in properties from Uranium. 



We hope this will be further examined. Mr. G.'s paper 

 on this subject to the Royal Society has been read, but is not 

 yet printed. We have another specimen from our friend 

 Mr. Rashleigh, where the spiculae are much smaller, and the 

 bundles composed in such a manner as to give it a cottony 

 appearance, whilst a few of the crystals are nearly like the 

 above. 



We have annexed to the plate a specimen from our liberal 

 friend last mentioned, which accords extremely well with 

 the common appearance of that from Barnstaple, showing 

 them to be the same, which has been doubted, and the crystal- 

 lization sufficiently corresponds with them. The part of the 

 gangue in which this is imbedded is of a grayish colour, and 

 somewhat though not distinctly approaching a schistose 

 appearance, like those from Barnstaple. The rest of the 

 matrix resembles that of the others from Cornwall, which 

 are whitish Quartz mingled with soft Mica, such as the 

 Cornish Apatite is generally found in. Those from 

 Cornwall were supposed to be different species from those 

 from Barnstaple. We are more confident with regard to 

 the crystals, from having been favoured by Dr. Wavell 

 with many interesting specimens, some of which have a 

 pearly appearance not before mentioned. All the specimens 

 figured in the present plate are from Stenna Gwinn in 

 Cornwall. 



