468 
tion it must lose some of the emanation. This may explain the variation of 
springs in the same locality. 
Observations made at the spring simply show the emanation content 
of the water. This may be due to three things. The emanation which is 
continually forming from traces of radium in the soil and rocks through which 
and over which the water passes is dissolved in the water and passes out with 
the water. It may be due to radium salts dissolved in the water. Or it may 
be due to some product of the thorium or actinium series. In the first case 
the water will show radioactivity by the emanation method and after stand- 
ing in a closed vessel for a month will not show any emanation. In the second 
case it may show radioactivity the same day as taken from the spring and 
after standing a month in a closed vessel it will show more or less emanation 
than at first. In any case the emanation content after standing one month 
is equal to the amount of radium dissolved in the water, since one curie is 
the amount of emanation which is in equilibrium with one gram of radium. 
All the observations given below are for the emanation content of the 
water as taken from the spring or well. These observations were taken from 
time to time on various springs and wells in Indiana and Ohio. The date 
of observation, approximate location of the spring, and temperature of the 
water at the spring is given. 
TABLE 5. 
SPRINGS. 
Curies, 
NAME. Loeation. Date. |Temp. C. Per 
| | Liter. 
: | : 
lll. Cent........| Bloomington Mar. 4, 1914. 12.5° |600.X10-12 
Youno... Brown County, Indiana Mar. 6, 1914. 16.° 355 
aGupns | Two miles southeast of Bloomington Mar. 13, 1914. 10.3° (430 
J.C. S. Old....| Two miles southeast of Bloomington Mar. 14,1914. | 11.5° |660 
FCS sseker te Two miles southeast of Bloomington May 16, 1914. | 115°) |170 
ill. Cent... Bloomington. . re a May 23, 1914. 12.2° 1265 
Stone .... Two miles southwest of Bloomington. May 23, 1914. | ie 77 
y/2imer.. . Three miles southwest of Bloomington May 23,1914. | 12.3° |175 
flottle.........| Bloomington. . . Sept. 24, 1914. | ied 650 
South. . Morning San, Ohio. Aug. 24, 1914. ie 420 
Cc. MeQ... .| One mile southeast of Morning Sun Sept 2, 1914. 16.° |560 
WES es sind One-half mile west of Morning Sun . Sept. 7, 1914. | 2 OO 
C. D. McQ.. .| One mile west of Morning Sun... . Sept. 7, 1914. 15.8° |250 
C. D. MeQ.....| (Wood) one mile west of Morning Sun Sept. 7, 1914. 19.5° (300 
W. P. McQ .| One mile west of Morning Sun : Sept. 7, 1914. l7.° 1610 
[Ce eRe .| Two miles west of Morning Sun. . Sept. 7, 1914. 19.5° |140 
fal. No. 1......| One mile northeast Col. C.O.. Sept. 7, 1914. ly faa 350 
Tal. Upper... | One mile northeast Col. C. O.. | Sept. 7, 1914. 17.° 1350 
| 
