on the same outline, corresponding with the faces on the 

 upper figure, so as to make them more distinct. This latter 

 is on the right hand of the column in most of the crystals 

 on this group, and has not been before noticed . The next 

 outline of a whole crystal lying on its column (from Cairn 

 Gorum) has this face on the column on the other side, 

 and a face on the edge of the pyramid and column, m of 

 Haiiy ; which is somewhat rare. The left-hand outline has 

 a little hollow in one corner, enclosing some liquid. The 

 next figure shows the water, as it is commonly called, 

 slightly magnified ; which is mostly known by a little blad- 

 der of air moving as the crystal is moved. There is some- 

 thing that floats in the liquid, and looks like soot, or 

 oxide of carbon. Crystals containing water or some liquid 

 are sold at a high price. I do not know that any substance 

 has been observed floating in the liquid within any crystal 

 before. 



The above group is in the collection of G. Laing, Esq. 

 of Edinburgh. The others are in my own cabinet. 



