A study of the absorption spectra of solutions of certain salts of potassium, cobalt, nickel, copper, chromium, erbium, praseodymium, neodymium, and uranium as affected by chemical agents and by temperature.

JONES, H.C. and W.W. STRONG.

Carnegie Inst., Washington, 1910.

26 cm. or cloth, gilt. x,160 pp. some ills, 98 plates. bibliography. -(very small libr stamp, good).