58 



The Philippine Journal of Science 



1914 



of the experiment. In order to accomplish this end, it was 

 necessary to take a large number of observations. The results 

 are summarized in Table I. 



Table I. — Radium e^nanation obtained from a given solution of radium 

 bromide by bubbling air through the solution under different conditions. 



Date. 



Dura- 

 tion of 

 expo- 

 sure. 



Radium 



in 



standard 



solution. 



Grams 



X109. 



Electroscope read- 

 ing in divisions 

 per minute. 



State of solu- 

 tion during 

 exposure. 



Method used to put solution 

 in "steady state." 



Due to 

 examina- 

 tion col- 

 lected in 



time of 

 exposure. 



Deduced 

 on basis 



of 

 20-hour 

 exposure 

 for solu- 

 tion con- 

 taining 

 0.628X 

 10-9 gram 

 of Ra. 



Series I. 



Hra. 













Oct. 25,1912 



3 



3.14 



0.528 



0.720 



Room tem- 



Air bubbled through cold 



Nov. 8, 1912 

 Mean -. 



3 



3.14 



t).580 



0.791 



perature. 



solution for 3 hours. 



0.755 



Series 11. 











! Nov. 25.1912 



5 



0.628 



0.240 



0.960 



Room tem- 



Air bubbled through boiling 



Dec. 4. 1912 



5 



0.628 



0.314 



1.256 



perature. 



solution for 1 hour and 



Dec. 6. 1912 



5 



0.628 



0.332 



1.328 





then through cold solution 



Dec. 11,1912 



5 



0.628 



0.311 



1.244 





for 2 hours. 



Dec. 19.1912 



5 



0.628 



0.320 



1.280 







Dec. 26.1912 



5 



0.628 



0.346 



1.384 







Jan. 10,1913 



5 



0.628 



0.306 



1.224 







Mar. 3.1913 

 Mean ._ 



5 



0.628 



0.333 



1.332 







1.251 



Series III. 













Oct. 30.1912 



3 



3.14 



0.751 



1.023 



Boiling 



Air bubbled through boiling 



Oct. 31,1912 



3 



3.14 



0.880 



1.201 





solution for 1 hour. 



Nov. 4.1912 



3 



3.14 



0.688 



0.938 







Nov. 6. 1912 

 Mean __ 



3 



3.14 



0.797 



1.089 







1.063 



Series IV. 











Oct. 28.1912 



3 



3.14 



1.063 



1.448 



Boiling 



Air bubbled through cold 



Nov. 11,1912 

 Mean _- 



3 



3.14 



1.070 



1.459 





solution for 4 hours. 



1.463 



Series V. 











Nov. 26. 1912 



5 



0.628 



0.388 



1.552 



Boiling 



Air bubbled through boiling 



Dec. 5, 1912 



5 



0.628 



0.378 



1.512 



k 



solution from 1 to 1.5 



Dec. 10,1912 



5 



0.628 



0.396 



1.584 





hours. 



Dec. 20,1912 



5 



0.628 



0.412 



1.648 







Dec. 29.1912 



5 



0.628 



0.383 



1.532 







Jan. 1. 1913 

 Mean __ 



5 



0.628 



0.410 



1.640 







1.578 



' 1 





