account of the great chemical reactivity of fused iron oxide it cannot be melted in any crucible so far developed. Many refractory materials have been investigated for this purpose, but all have been found to contaminate the molten oxide. The method finally adopted consists in fusing the oxide in a protecting bed of the same material. The electrical conductivity of the oxide is sufficiently great so that the material may be melted between water-cooled iron electrodes. Promoters are readily added to the iron oxide in this method of fusion, and all those substances which are known to react unfavorably can be carefully excluded.-Pixed Nitrogen Research Laboratory, Washington, D. C.
ERRATA Val. 2. No. 9. n. 733, first . ~ a r a. n a ~ h . - T h efifth sentence should read as follows: "Of what use is our research, our study of technical trivialities, while souls are scorching. athirst for the sustenance which real knowledge can give?' p. 735, next t o last paragraph.-"It t o be useless.
. . ."
is useless to insist.
. . ." should be, "It
seems
No. 11, p. 1066.-TheLatin quotation should read: Usus DecimlJium numeforum. Mensurw & fiondcra diuidantur i n 10, perks ocguaks, b sing& decimae rursum in d i a s aequeles 10, quae i5n efunt ce?&simae lolizrs: A&ue herum singuhe ierum i n 10, quae firoinde iam erunt nillesimae totius.
CHEMISTRY IN INDUSTRY Through the courtesy of the Chemical Foundation, Inc., several sections of the American Chemical Society earned a few dollars fcr local expenses through the sale of "Chemistry in Industry," Volume I. This book is mailed t o individuals for one dollar but if lots of one hundred are ordered sent t o a single address a saving in packing and postage enables the Foundation t o mske a price of $75 for the lot. Volume I1 is now available on the same basis. The two books give 43 examples of chemistry in the service of industry, each chapter written by a specialist in the field. Many teachers of chemistry require their students to own t h e e volumes for supplementary reading and reference. I n purchasing a lot and disposing of them a local section or a teacher of chemistry is performing a constructive service in thus aiding in the dissemination of chemical information. A lot of one hundred of Volume I or of Volume I1 may be had for $75, or the two volumes mined in whatever proportion may he wanted can be had a t the rate of $75 per hundred sent to a single address. Any orders should be sent to the Committee on Prize Essays, Paul Smith, Secretary, 85 Beaver St., New York, N. Y.
