2755
JOURNAL OF CHEMICAL EDUCATION
researches. Such papers have no place in a compilation of this kind. Should they be desired, reference t o them may be found through the Engineering Index, Industrial Arts Index, Chemical Abstracts, and other indexes and abstract journals available in any large library. Reference t o bibliographies on many special subjects covered in this compilation may be found in West and Berolzheimer's 'Bibliography of Bibliographies on Chemistry and Chemical Technology,' issued as Bulletins 50 and 71 of the National Research Council." Both books and general articles are included, and references are listed under eighty-two main topics, alphabetically arranged. Invaluable far the professor of industrial chemistry and for the teacher of general chemistry who desires t o indude practical applications of chemical principles in his course. 0 . R.
Uses of various (Carl Schleicher & Schiill) filter papers are indexed, not only under the various headings of different industries, but also under the names of the substances to be filtered, the ingredient t o be determined, and the product t o be analyzed. 0. R. Digest of Legislation Providing Federal Subsidies for Education. WARD W. KRESECKER, Associate Specialist in School Legislation. Office of Education. United States Department of the Interior, Office-of Education, Bulletin, 1930, No. 8. U. S. Government Printing Office,Washington. D. C. (For sale by Superintendent df Documents.) 12 X 23 em. $0.10.
College and University Extension Helps in Adult Education. L. R. ALDERMAN, Specialist in Adult Education, Office of BULLETINS Education. U. S. Department of the Interior, O5ce of Education, Bulktin, Filtration in Chemical Laboratories. A Handbook on Filtering Operations for 1930,No. 10. U.S. Government Printthe Chemist. C m SCHLEICHER& , ing Office, Washington, D. C. (For sale Scnib,~. New York City, 1927. 14.5 by Superintendent of Documents.) X 21.5 em. 1P X 23 cm. $0.10.
Study of Corrosive Action of Iodine. Studies on how.iodine wrrades metals were reported a t the recent meeting in Baltimore of the American Pharmaceutical Association by B. L. Meredith and W. G. Christiansen of Brooklyn, N. Y. Several alloys of metals that are resistant to most chemicals were experimented on. Bath molten and vaporous iodine were used, but all the metals were corroded by the iodine, the investigators found.-Sckce SeNice Stonelike Product, Maizolith, Made from Corncobs. Maizolith, a substance hard as stone andstronger thanmost kindsof wwd,is one of thenewestproducts of chemical magic working on cornfield wastes. It can be made from any part of the w r n plant, but mast advantageously from corncobs. It is one of the things that have been made by the chemists of Iowa State College a t Ames, and has recently been undergoing tests on a semicommercial scale a t the U. S. Bureau of Standards. It is prepared by chemically digesting the m w b s , reducing them t o a uniform jelly-like pulp in certain standard paper-mill machmery, and pressing the jelly in a mold. The resulting solid material is a dense, hard, bonelike substance, ranging in color from a golden tan to a deep ebony. It is somewhat stronger than the hardwwds, and is a good electrical insulator. It can be machined and polished into non-metallic -a m ., washers.. ~ .a n e l s ,and other obiects such as are now made from hard rubber and Bakelite. It is estimated that a commercial ~ l a nwith t a ~roductioncarracitv . . of five tons per day could manufacture it st a cast of about $240 a ton. The cost might be cut if it is manufactured as a by-product in other cornstalk industries. Its trade name, Maizolith, means into "corn-stone."-Science Senice
