10 A A N A L Y T I C A L C H E M I S T R Y

More than a Catalog! The new Arthur S. La Pine & Company Catalog " B " is a reference book of modern scientific instruments. It lists and describes, in detail, the latest products of America's leadmg instrument manufacturers. The descriptions give the information you, the buyer, are interested in obtaining. Dimensions, graduations, calibrations, divisions, ranges, sensitivities, voltages, power requirements, porosities, etc., are clearly presented. Frequent references to speci­fications and tests, such as those of the A.S.T.M., A.A.S. H.O., A.P.H.A., and A.P.I, to name a few, further help to identify the item you are looking for. Titles are in plain,

bold face type, and the text, which fills more than 900 pages, is set and spaced to make reading easy. Running heads at the top of each page enable you to "flip" through the book to find a particular group of instruments quickly. Or you can refer to the complete index. I t is amply cross-referenced and cross-indexed, and you will not have trouble in locating what you want. Here is a truely modern catalog—one that is a pleasure to use! To obtain your copy, please request on your com­pany letterhead, giving your full name, position, and ad­dress. We will be happy to send you one.

• noo CHEMICALS ° ° ° o

LAPINE LABORATORY SUPPLIES

ARTHUR S. LA PINE & COMPANY 6005 S. KNOX AVENUE, CHICAGO 29, ILL.