On the Kinetic Theory of Gravitation. 297 



Cadmium, KH. 



Wave-lengths. Quotients. Theoretical. 



647-22 647-08 1-0000 1-0000 1-0000 1 



644-59 1-0041 1*0041 l + a+28 



531*27 531-01 1-2182 1*2186 1-2300 l + 2a 



509-00 508-83 1-2715 1-2717 1-2727 1 + 56 



480-56 480-27 1-3468 1-3473 1-3450 l + 3a 



468-10 1-3826 1-3818 1 + 76 



441-94 441-81 1-4645 1-4646 1*4600 l + 4a 



The quotient of Kirchhoff's sixth wave-length by the seventh 

 (468-10+441-94) is equal to the quotient of the fourth bv the 

 fifth (509-^480-56 = 1-0592). 



Lanthanum, K. 



Wave-lengths. Quotients. Theoretical. 



538-56 1-0000 1-0000 1 



538-43 1-0003 1-0003 1 + ia 



538-00 1-0011 1-0011 1+a 



534-48 1-0077 1-0077 1+ la 



520-80 1-0341 1-0340 1+ 31a 



519-20 1-0373 1-0373 1+ 34a 



518-69 1-0383 1-0384 1+ 35« 



481-59 1-1183 1-1183 l + 108a 



XLII. The Bearing of the Kinetic Theory of Gravitation on 

 the Phenomena of " Cohesion " and " Chemical Action," 

 together with the important connected Inferences regarding 

 the existence of Stores of Motion in Space. By S. Tolver 

 Preston*. 



No. IV f- 

 1. XT would be natural to expect that any theory competent 

 J- to explain the effects of gravity ought to be able to 

 throw some light upon the subsidiary effects of molecules ex- 

 hibited in " cohesion/' " chemical action," &c. Before pro- 

 ceeding to consider this question, and in order to have a clear 

 conception of the point we have to deal with, we will reca- 

 pitulate in a few words the physical conditions involved in the 

 case of gravity as already dealt with. It has been our object 

 to point out that the molecules of a gas within the range of 

 free path are moving in precisely the right way to produce 



* Communicated by the Author. 



t The three previous papers treating of the subject of gravitation are 

 iri the Philosophical Magazine for September and November 1877, and 

 February 1878. 



