Value of Native Gold, cc. 215 
as to differ little from quartz in weight. The following 
experiments were made in order to determine the average 
specific gravity of auriferous quartz :— 
15. Quartz from the Turon, 
Grains, 
Weighed in air.......scssccsecreere O30'D 
Weighed in water ......c.00.0. 330715 
WifferenCewen.cccccececcevees« 200100 
ani x 1000 = 2607 Sp. Gr. 
205°35 
16. Veined Quartz, with a trace of Gold, from Mount Alexander, 
Grains. 
Weighed in ai¥.....cccccccssseeesee 639°9 
Weighed in water .......s.0 ww. 8965 
Difference ..ccccccccccerscsasee 2400) 
~ 
39°5 
243-0 * 1000 = 2631 Sp. Gr. 
17. Veined Quartz from the spurs of Ben Lomond, near Fingal, 
Grains. 
Weighed in @if......sccceccseeseeee 234°75 
Weighed in water ....ccccoceeee 145°25 
Difference ......ssesssereereere 89°50 
234°75 
sags 1000 — 2625) Sp: Gr. 
18. Quartz from Fingal, 
Grains. 
Wretched tn aitics.: sen-cco-ese-0) 1201 
Weighed in water ......ccee00. 740°75 
Difference ....ccccccssesesee 460°25 
1201 
460-25 X 1000 = 2606°6 Sp. Gr. 
19. Second specimen of same, 
Grains. 
Weighed in air ..sscccccsrssseeee 899 
Weighed in water ....cecceee. 556°S 
——— 
Difference  ..ccoccsecssssecee 042°9 
3aa'5 * 1000 = 2624°6 
