( 1220 ) 
tioned should be perfectly accurate, viz. 1. For the quantity - 2 
9 
1b d*b 
the quantity (5) ‚and 3 the quantity bad 
dv k 2 dv? k 
: 2 be : “oh dp 
|. The quantity — is found by determining | 7 — | : equal to 
by aT), 
EH J v 
gn 
= —, Of == — = ———., from which follows: 
p (wl) s (v-—b)x br 
With 7s — 8, we should find: 
b 8 
Te — 
bg tf 
I shall, however, not at once suppose rs = 8, nor (f—1) r? = 27, 
Init assume rs —=c,, and (f—1)r? =c,, and c, and c, to be variable 
with 7. Differentiating the relation : 
ie ah eg eee Ne art ett (a, Seon ene 
bg ‘A ig 
with respect to 7 we get, because by does not depend on r: 
db €, df 1 de, 
bad: fed ei a dr 
or 
dhr 1 + ne Bens gi 
dv}, Jide of ar 
ip ke LE ret 
From (f—1)r’ =e, HOWE ae Ig age? en of 
which we get: 
dbx. Be Gy 2s (ft) a 6, jd de, I de, 
dor A a : cdr we f dr ‘ 
f c 2 2 
And by means of the relation —-= = constant, or 
: 6 “\ f—=1 
2 de, de, 
€, re Co 
finally : 
dbj. 2s(f—1 de, f—2 
dh am ee hhh Littin oe, 
ro AA drf 
The equation (IV) gives us the fraction which in the critical point 
is the quantity 4 of bg. It appears, as was to be expected, to be 
| 
