98 Canadian Record of Science. 



England. On careful examination a small diamond was 

 detected on the surface of one of these. On breaking the 

 boulder others were revealed. The most interesting 

 fragment was sent by Mr. Trubenbach to Sir W. Crookes, 

 who showed it to me. Examination with a hand lens 

 convinced me that the rock could not be a concretion of 

 the " blue ground," but was truly holocrystalline and 

 allied to the eclogites. Sir W. Crookes generously waived 

 his own claim to study the specimen, and obtained for me 

 permission from Mr. Trubenbach to have slices cut from 

 it. I gladly take this opportunity of expressing my 

 gratitude to both gentlemen ; to Sir W. Crookes for 

 allowing me to carry out this interesting investigation, 

 and to Mr. Trubenbach for his great liberality in placing 

 at my disposal a considerable suite of specimens (including 

 other boulders) from the ISTewlands mines, and for the 

 trouble which he has taken in aifording me the necessary 

 information. 



Prior to the discovery, just mentioned, one or two 

 instances had occurred at the De Beers Mine of a diamond 

 apparently enclosed by or projecting into a pyrope. One 

 such, the garnet being the size of a rather large pea, is in 

 the collection at Freiberg (Saxony), to which it was 

 presented in 1892.^ 



The specimen found by Mr. Trubenbach at the New- 

 lands mine was a piece of blue ground,' with a pyrope 

 projecting from one angle. A small, apparently broken, 

 diamond seems embedded at the top. The others (five) 

 are well crystallised, two on one side, three almost in 

 contact on the other. The pyrope (which has a kelyphite 

 rim) seems to be indented by two, but to have once in- 

 cluded the others, as they are in contact with the un- 

 altered mineral. We were thus brought so far as to 

 associate the diamond with the pyrope ; though this 



I A. W. Stelzner, " Sitzuiigber. der Isis zu Uie.sdeii," 1893, s. SO, anil U. Beck 

 ./jutUh.f. Pniktische Geologic, 189S (May, p. 1(33). 



