348 Scientific Proceedings, Royal Dublin Society. 



lY. Myoma of uterus. 



155 grams treated in 150c.c.'s HCI : diluted to 800 e.c.'s. 

 Electroscope steady, at 4 scale-divisions per hour. 

 Conclusion. — No tliorium exceeding I'B x 10"' gram per gram. 



V. Cancer of bread. — 



89 grams in 100 c.e.'s HOI : diluted to 800 c.c's. 



Electroscope steady at 3 divisions per hour. 



Conclusion. — No thorium exceeding 2*2 x 10"' gram per gram. 



VI. Sarcoma of knee. 



80 grams treated as in V. 



Electroscope steady at 3 divisions per hour. 



Conclusion. — No thorium exceeding 2'5 x 10"' gram per gram. 



It is desirable that the above results — whicli, as will be seen, are con- 

 sistently negative — should be extended. They possess a practical bearing ; 

 for if it can be shown that thorium introduced into the system is, in everj^ 

 case, again eliminated while radium compounds remain stored, or become 

 segregated, within the body, the use of tliorium for internal administration 

 would possess advantages over the use of radium. Eor this as well as for 

 other reasons the whole subject of the retention and segregation of the 

 radioactive elements in the body deserves full and systematic investigation. 



