IXDIRBCT EFFECT OF X-RAYS OX THE .7ENSEX-SA11C0MA 



755 



Comparison of the Volume Increases in the Anterior and Posterior 

 Sarcomas 



In connexion with the study of the behaviour of irradiated and shield- 

 ed sarcomas it was of interest to compare the increases in volume of the 

 two unirradiated sarcomas placed by inoculation inio the rat. To faci- 

 litate comparison of the rcsuHs of this experiment wi1h Hiose of 1he 



Table 13. — Measurements of Volume of the 



Unirradiated Posterior and Anterior Sarcomas 



OF Rats. Summary of Results 



(Percentage increase calculated in the same way as 

 for irradiated animals) 



irradiation experiments we have determined the daily average increase 

 in volume in three consecutive time intervals, i.e. in periods of 3, 6 and 

 8 days. Table 12 contains the example of an experimental sequence. 

 There is no essential difference between the increases in the two sarco- 

 mas. An average of the mean values for the eight experiments, which 

 are summarized in Table 13, shows, on the contrary, that in the time inter- 

 val corresponding to the irradiation period in the irradiation experiments, 

 the percentage increases in the two sarcomas are nearly identical, but 



48* 



