200 



ADVENTURES IX RADIOISOTOPE RESEARCH 



RESULTS 



Tho result obtained are shown in the following tables. 



Table 2. — Mother injected Febrxarv 

 9. Date of gestation: February 



18. Replacement of the active by an 



INACTIVE mother: Febri'ary 22. 



(Experi:\iknt 1.) 



,i 'Ji 



Loss of ^'~i' in the course of 81 days: 60 per cent. 



In about 3 months, ^ a time sufficient for mice to reach adulthood. 



Table 3. — Mother injected February 

 9. Date of gestation: February 16. 

 Replacement of the .active by 

 ->.^ an inactive mother: february 23. 



(Experiment 3.) 



Loss of ^"P ill the course of 103 days: 01 per cent. 



only about 60 per cent of the ^^p content of the mouse acquired by birth 

 is thus eliminated. The phosphorus content of the new-born mouse is 

 found to be about 4 mgm the amount of P excreted by the mouse in the 



1 If only the last two values in Tables 2 and 3 are considered the average 

 loss of 32P in 80 days works out at 57 per cent. If all mice killed in Ajaril, 

 -May and June are considered, the average loss is 56 per cent in 72 days. 



