435 
as ions, the results expressed in grams in 100 cc. water. No. 1 is described 
as the yellow or more northerly lake and No. 2 as the green one. 
No. 1. No. 2. 
Total solids 2. 6988 6. 0022 
Fe . 1315 . 3036 
Fe . 0209 . 0612 
Na . 6471 1. 2405 
K . 0372 . 1821 
Cl 1. 2873 3. 4596 
SO, . 4122 ~. 4186 
PO, . 0396 . 0515 
Al - O14 ae 2 ea 
Mg . 0264 . 0335 
Ca . 0150 . 0136 
Free acid cale. as H, SO, 15% 
Free acid calc. as HCl . 894 
SiO, . 0640 074 
A comparison of these two analyses with the recent ones from this 
laboratory shows a marked difference; the water we obtained is much 
more concentrated and the content of free acid is higher. 
In connection with the study of the radio-activity of these waters, 
some very curious phenomena were noted, of which it is desired to make 
a preliminary announcement at this time. The general arrangement of 
the apparatus we used was that of H. Mache.? In place of the large 
bell-jar containing the electroscope, a Novy anaérobic jar was used. In 
this was constructed an electroscope similar to that described by Bolt- 
wood.* Behind the gold leaf was placed a photographed scale which 
was magnified by a suitable arrangement. In ordinary, diffuse light in 
the middle hours of the day, the rate of discharge of the electroscope was 
very constant, the gold leaf moving one division of the scale in five 
minutes. However, it was noted that late in the afternoon the rate 
became much slower, being one division in ten to fifteen minutes. In 
the sunlight it was found that the discharge rate was very markedly 
increased, averaging 18 divisions in five minutes. Experiments in total 
darkness gave a total discharge rate of 1 division in two hours. These 
experiments in each case extended over a period of from thirty minutes to 
four hours and the rate was then calculated to a unit time of five minutes ; 
however, readings were generally made every five minutes, and for given 
conditions the rate was usually quite uniform throughout a series. We 
have also noted a singular behavior in uranium salts placed in the 
sunlight. The air passed through an aqueous solution of a uranium salt 
after the latter had been exposed to sunlight for a short time is about | 
twice as active in discharging the electroscope as it is from the same 
solution kept in diffused light, this acquired activity being rapidly lost 
* Monatshefte fiir Chemie (1905), 26, 595. 
*Am. Jour. of Sci. (Sill.) (1904), 18, 97. 
