46 THE CANADIAN NATURALIST. [March 



detached, and in this way, as well as from one blast on the island, 

 1,336 lbs. of ore were obtained. This quantity of ore was sent to 

 Montreal, where, in the month of December, it was carefully 

 weighed and sampled. The richest pieces, varying in weight from 

 a few ounces to 41 pounds, were picked out, weighing in all 93|^ lbs. 

 Eight of these, supposed to represent the average, were placed in 

 sealed bags and marked sample No. 1. A large piece of veinstone, 

 measuring three feet by twelve to sixteen inches by six to twelve 

 inches, and weighing 481 lbs., was sampled by drilling six holes 

 through it at points as nearly as possible equidistant from each 

 other. The borings, quartered down in the usual manner and 

 then ground and well mixed together, constituted sample No, 2. 

 The fragments of ore of ordinary quality, weighing 250f lbs., 

 were sampled by chipping oft" pieces from them. The pieces, 

 ground to powder and quartered down, made sample No. 3. The 

 remainder of the ore was broken down into small pieces and well 

 mixed with the ore which had broken off the larger fragments. 

 It weighed 511 lbs., and was regularly quartered down, the 

 resulting sample being ground fine, well mixed, and marked No. 

 4. Eight portions of each of the powdered samples were placed in 

 sealed bottles, all properly labelled. The following table gives 

 the results obtained by Professor Chapman, Dr. Hayes, and 

 myself in assaying the various samples, the ton being taken at 

 2240 lbs., and the value of silver at §1.24 per ounce troy. This 

 value is based upon the price recently quoted in England for bar 

 silver, namely 5s. Ofd. per oz. : — 



Per Centages. 



No. I. No. 2. No. 3. No. 4. Average. 



Professor. Chapman 1496 788 527 i'7i S'S^S 



Dr. Hayes 4117 11-26 5-82 i-i8 8-471 



T. Macfarlane i3'i4 73 4'94 i'82 5-168 



Ounces per Ton. 



No. I. No. 2. No. 3. No. 4. Average. 



Professor Chapman 4,886 2.574 i>72i 55S 1,804 



Dr. Hayes 15,064 3,678 1,901 385 2,767 



T. Macfarlane 4,292 2,384 1,613 594 1,690 



Silver Values per Ton. 



No. I. No. 2. No. 3. No. 4. Average. 



Professor Chapman $5,058 ;?3,i9i ^2,134 $691 $2,236 



Dr. Hayes 18,679 4.560 2,357 477 3,431 



T. Macfarlane 5,332 2,956 2,000 736 2,095 



If the -average of these amounts be taken, it amounts to 6-387 

 per cent, silver = 2087 ounces, or |2,587.88 per ton of 2,240 



