J. H. Lane on the Theoretical Temperature of the Sun. 78 
brium would assign is notably diminished, and that it would be 
found that the circulation of the air is sufficiently active to 
mask the theoretic rate of diffusion. 
The second hypothesis which might offer itself in an attempt 
to make the theory rational, but which a very little reflection 
is, I think, sufficient to set aside, is that which would modify 
Clausius’ theory of the gases by assuming that in the sun’s 
at nearest approach. This way of harmonizing the actual 
000° Fah. in 
ner it involves the consequence that in any such small contrac- 
tion of the photosphere as can have taken place within the 
of elasticity of any form of matter known to us. 
Tn conclusion, Ido not mean to say that there is any invinei- 
ble ul exclusion of any law of the action of gases different 
from what is specified or alluded to above. I only mean that, 
so far as I can see, any theory of heat which is based simply 
and solely eee molecular attraction and repulsion ¢ 
molecular distance alone, cannot in its application to the sun, 
