The publishers of PHYSICS, by G. Shortley and D. Williams, Prentice-Hall, Inc., New York, 1950 (noted in the Books Received section ofPhysics Todayfor December, 1950), have informed us that they erroneously quoted the trade prices of $6.00 and $7.35 for volumes I and II respectively of this work. The cost for college people is $4.50 and $5.00 instead of the higher book store prices.