J. H. Lane on the Theoretical Temperature of the Sun. 71 
case, re t 
average length of the described by each between collisions 
is large compared with the diameter of the sphere of effective 
attraction or repulsion of atom for atom, the value of & would 
reach its maximum of 1%. Experiment has not shown us an 
gas in this condition, and for the — it is hy athetioal 
ven in hydrogen the value of & does not materi 
is split into mE free atoms equally as small, then, while the 
value of & would be 1%, the value of « would be about 1600 
If with these values we repeat the calculation of the 
and pr We fin 
equivalent of all the heat that a cubic foot of the layer would 
ne out in cooling down, under pressure, to zero, would be no 
ess than 13,500,000 foot pounds. Instead, therefore, of a layer 
ten miles thick, it would now require only a thickness of 88 feet 
