* 
226 J. D. Dana on the Isomorphism and ‘ 
lite = 
1 Si=577-31 8. atoms of acid and bases, 4. ¢. atoms of elements, 
2%;Mg 694-1 A. 139413-+8°35 (sp. gr)=416 
C. 416-+10=416 
salle age 
a, At, weight, 139418 ; oe 
3, Serpentine, bias 
9 Mg 2290:50 A. 5274°62+-2°55 (sp. gr.)=2068°5 
6H 674-88 B. 20685-+-19=109 C. 2068'5-+-46=44-9 
Fr Fe 12272 B. 416+4=104 Ex 
ery 
4 Si= 2309-24 . atoms of acid and bases, 19. ¢. atoms of elements, 46. 
a. At. weight, 5274°62 
4, Villarsite. 
4 Six 2809-24 6, atoms of acid and bases, 19. c, atoms of elements, 46. 
12 Mg 3054-0 A. 5700°68+-2-975 (sp. gr.)==19163 
8H 33744 B. 19163+19=10086 C. 19163-+-46=41°65 
a. At. weight, 5700-68 * 
5. Picrosmine. 
4 Si 2309-24 2. atoms of acid and bases, 13. ¢. atoms of elements, 34. 
6 Mg 15270 A. 4173°68+-2°63 (sp. gr.)=1587 
8H 337-44 B, 1587+-138=122 C. 1587-+84==46'68 
a, At. weight, 4173°68 
6. Epsom Salt, 
18= 500 6. atoms of acid and bases, 9. ¢. atoms of elements, 20. 
1Mg 2545 A, 1541:'86+1°75 (sp. gr.)=881 
7H 787-36 B. 881-+-9=98 C, 881-+-20=44 
a. At. weight, 1541:86 
The result shows that these different substances have: for atomic 
volume C, Chrysolite 416, Villarsite 41-65, Epsom salt 44, Ser- 
pentine 44-9, Picrosmine 46-7; and for Chrysoberyl 309, (adopting 
Awdejew’s atomic weight,) which is to that of Chrysolite as 2:3; 
or with the old atomic weight 37°15, a little below that of Chrys- 
olite. The B results are also nearly uniform; they are for Chrys- 
olite 104, for Villarsite 100-86, Epsom salt 98, Serpentine 109, 
Picrosmine 122, Chrysoberyl 108-9, or with the old atomic weight, 
185:77. It would seem from the result with Epsom salt, that it 
is more correct to consider the hydrogen in water as a single 
rather than a double atom. _ 
e pass on with the other examples without special remark, 
the results being tabulated on a subsequent page. 
IL. Quartz, Chabazite. , 
1. Quartz. = 
*__ keh, 212 OBR aia —2-4==54'5. 
: bat ee 57731 A. 57731+-2°65 (sp. gr.}=218. C. 218-+4=5 
8 Si=4618-48 5. atoms of acid and bases, 32. ¢. atoms of elements, 89. 
3 Al 1925-4 A. 9622'99-+-2°1 (sp. gr.)=45824 
3 Ca 105447 B, 45824+329=143, ©. 45824+89=515 
18H 2024-64 
a. At. weight, 9622-99 
