[Feb. 17, 
Dr. M. Haaland. 
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in the young control mice than in the 
tumours have grown better 
When the cancer-mice are compared with 
spontaneously affected animals. 
old mice of the same age, there seems to be a difference in some experiments 
This is the case in 
in the case of certain tumours in favour of the former. 
1). A similar difference seems to be 
oe 
g. 
present in the results of implantation of some spontaneous tumours (v2de Table, 
the experiment recorded on the chart (fi 
prod: 
hardly any such difference can be discovered, 
d 
In other experiments 
