TRANSACTIONS OF SOCIETIES. . JQI 



Royal Society of South Africa. — Wednesday, April i6th: Prof. 

 J. D. F. Gilchrist, M.A., D.Sc, Ph.D., F.L.S., C.M.Z.S., President, in the 

 chair. — "Some controversial notes on the diamond": Dr. J. R. Suttojn. 

 The spontaneous breaking of diamonds was discussed, and the previous 

 conclusions of the author on the subject re-affirmed. It was claimed that 

 there is no fundamental difference of process between the breaking of a 

 pure colourless crystal, containing an inclusion of foreign mineral, and 

 that of opaque or clouded diamond. The probable derivation of distorted 

 diamonds from groups and clusters was also discussed. It was stated 

 that the hardness of the diamond is generally overestimated. 



