FW. Clarke on the Atomic Volumes of the Elements, 311 
Oxygen, 2:6 5:2 78 10-4 13-0 (12°) | 
u - 
Sulphur, .. .. .. 10-4 (107) | 15°6 _.. 23-4 (22°8) 28°6 
Selenium, -. _. _. 10°4 (108) 15°6 (103) 23°4 (a) __. 
Ns oo ck ge ee Oe (207) Le 
Of these thirteen numbers six need no alteration, and the 
amount of change in the other seven, varies from a minimum 
of 0-1 to amaximum of 0°9. Moreover, from 2°6 up to 28°6, 
ut two multiples of the lowest are wanting, and if we place, 
from theoretical reasons given above, the atomic volume of 
oe tellurium at 31:2, this relation becomes still more note- 
Worthy, 
OL SE Te CeO aT EE ROT oe 
It is worth while in this connection to observe the remark- 
_ able multiple relation connecting the atomic weights of this 
gto 
Sn ET MO eT: OEE red 
up. 
Between the different allotropic conditions of sulphur and 
Selenium I find no numerical relations whatever. The atomic 
ie ele EE EA 
SY ens ALE Clee ro 
fer as I have examined, it seems to pos 
One of these is easily found, Kopp determined the atomic 
Volume of NO, in nitrates, as 28°6: and if we subtract from 
— the numbers which required no alteration, parentheses seemed unneces- 
