eT eg ae ae ae Ee ee UNE RE ree, 
a ee: 
J. W. Langley—Chemical Affinity. 439 
her group which does not invite the aid of mathematics, the 
great analytic science of immaterial things? It is because 
three fundamental conceptions underlie physics while only two 
serve the needs of the chemist 
Au, Jour, Sct.—Turrp Series, Vou. XXVIII, No. 168.—Dec., 1884, 
28 
