298 Proceedings of the Royal Society of Edinburgh. [Sess. 
§ 18. In each of Tables I V. below, the second column gives the value 
of 1/x, which is also the value of r when cr is unity in equations (23) and 
(32) of Lord Kelvin’s paper. In Tables I — IV., column 3 enables us to 
find the curve of temperature, and column 4 the curve of density, for any 
spherical nebula for which k has the value, 1*5, 2 '5, 3, or 4 (see equations 
(26) and (19) of the paper) : column 5 gives the mass of gas within each 
sphere of radius r [see equation (51)]. In Table V., column 3 enables us 
to determine the density at any point in a spherical mass of ideal Boylean 
Gas, and column 4 the mass of gas within radius r (see equations (40) and 
(41) of § 36). 
