Page:A treatise on diamonds and precious stones including their history Natural and commercial.djvu/68

 duced accompanied with a particular sensation on the nerves in contact with them—Or, if a diamond and a pebble, of equal size, be rubbed together in the same manner, the diamond will not be easily moved, as its projecting surface will penetrate the pebble.

ascertain the supposed phosphorescence of diamonds | have tried many experiments (described by authors) without any satisfactory result, nor have my friends had any better success, even in a single instance.

combustion of the Diamond is a property very generally known. It burns with great brilliancy underaflame urged by oxygen gas; and if exposed on a support of clay to a strong heat, it may be totally consumed.