NOVUM ORGANUM 143 



33. The approach toward a hot body increases heat in 

 proportion to the approximation; a similar effect to that of 

 light, for the nearer any object is placed toward the light, 

 the more visible it becomes. 



34. The&quot; union of different heats increases heat, unless 

 the substances be mixed; for a large and small fire in the 

 same spot tend mutually to increase each other s heat, but 

 lukewarm water poured into boiling water cools it. 



35. The continued neighborhood of a warm body in 

 creases heat. For the heat, which perpetually passes and 

 emanates from it, being mixed with that which preceded it, 

 multiplies the whole. A fire, for instance, does not warm 

 a room in half an hour as much as the same fire would in 

 an hour. This does not apply to light, for a lamp or candle 

 placed in a spot gives no more light by remaining there, 

 than it did at first. 



36. The irritation of surrounding cold increases heat, as 

 may be seen in fires during a sharp frost. We think that 

 this is owing not merely to the confinement and compression 

 of the heat (which forms a sort of union), but also by the 

 exasperation of it, as when the air or a stick are violently 

 compressed or bent, they recoil, not only to the point they 

 first occupied, but still further back. Let an accurate ex 

 periment, therefore, be made with a stick, or something of 

 the kind, put into the flame, in order to see whether it be 

 not sooner burned at the sides than in the middle of it. 28 



27 The fires supply fresh heat, the water has only a. certain quantity of heat, 

 which being diffused over a fresh supply of cooler water, must be on the whole 

 lowered. 



28 If condensation were the cause of the greater heat, Bacon concludes the 

 centre of the flame would be the hotter part, and vice versd. The fact is, 

 neither of the causes assigned by Bacon is the true one; for the fire burns 



