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ME. W. CROOKES ON EEPULSION RESULTING EEOM RADIATION. 
therefore move from B. In the same manner it can be shown that B will move from A. 
The result will therefore be mutual repulsion. 
Case II. Two cold bodies, A and B, in space of a higher temperature than themselves. 
Fig. 2. Case I. Fig. 2. Case II. 
A will receive much heat from space, except where B cuts it off, and on that side it will 
only receive slight radiation from B. A will therefore be driven towards B. In the 
same manner it can be shown that B will be driven towards A ; and the result will 
therefore be an apparent mutual attraction. 
Case III. Two bodies, A hot and B cold, in cold space. The body A receives heat 
uniformly from all sides, even from that opposite B (B being of the same temperature 
as space). A will therefore not move. B receives heat uniformly from all sides, except 
from that opposite A, on which side the influx of heat is more intense. The result will 
therefore be that A remains stationary whilst B is repelled. 
Fig. 2. Case III. Fig. 2. Case IY. 
Case IV. Two bodies, A hot and B cold, in hot space. The body A receives heat 
uniformly from all sides, except from that opposite B. Here the heat is less intense. 
A is therefore driven towards B by the extra influx of heat on the other side of A. B 
receives strong influx. of heat from all sides, and just as much from the side opposite A 
