324 
ME. W. CROOKES OK THE ATOMIC WEIGHT OF THALLIUM. 
By Table B, 
0-378§ v for £=22-7 = 5-17 millims. 
759*22 — 5-17 = 753 05 ; 
log (753-05)= (2-8768238 — 10) +4-198515 = 
t h 7 Ai7f'oooo 1 a i dens, atmos. air 
loo- /-0/5o338 — 10=log , 
° max. dens, water 
Second Weighing in a Mare Atmosphere. 
By Table A the value of 
o-omeqqR i 
I(? g 1+0-00365^ 7^8 for t=21 ° C- = (4T98959— 10) + 2-0532321 = 6*2521911 — 10= 
j dens, rare air 
° max. dens, water 
Value of 0 - 378§ v for 7= 21°C. = 4 , 66 millims. : 
117-70 millims. (pressure) — 4-66 = 113*04 — 0*378^ 
log ^=1-6834703 + 6-2521911 — 10 = 7-9356014 — 10 ; 
.-. -0086231 = 2 = weight of rare air displaced by y. 
The data now are, — 
w=1005-425937, 
x = 0-059140, 
y =1005-726438, 
2 = 0-0086231, 
log ^=6-2521911 — 7-07653388=9-1768523 — 10. 
Hence n=j= -15026 : 
1 -n =-84974, 
=1005-726438 — 1005-425937 = -300501, 
x-z =*059140 — -008623 + =-050517 ; 
.-. m—y—w+x—z=’ 351018. 
£;=-- = log -351018— log -84974 = -545341 8 — -9292861 = -6160557 =^=-4131, 
' w—a= 1005-425937 — -059140 = 1005-366797. 
(w—x ) — #=1005-366797 — -4131 = 1005-779897 =7^ = true weight of glass apparatus 
plus nitrate of thallium in vacuo. 
1005-779897 — 766-133831 (weight of glass apparatus in vacuo) =239-646066= weight 
of nitrate of thallium in vacuo. 
239-646066—239-611359 (weight of nitrate of thallium in air) =-034707= increase in 
weight for vacuum. 
