24
JOURNAL OF CHEMICAL EDUCATION
.
JANUARY, 1930
States a necessity that it is now getting only in limited quantities of inferior quality a t a cost of many million dollars per year. Acknowledgment The author wishes to take this opportunity to thank the following for their assistance: DIRECTOR WILMONNEWELL,DR. 0. F. BURGER, PROP. J. R. WATSON, MR. HAROLD MOWRY, and DR. 0. C. BRYAN of the University of Florida; DR. DAVID FAIRCHILD, MR. WILSON POPENOE, MR. R. A. YOUNG, and MR. H. C. SKEELS of the Office of Foreign Seed and Plant Introduction a t washington; HENRY A. GARDNER, Director of Scientific Research of the Paint and Varnish Manufacturers' Associations; ASSISTANT DIRECTORE. H. WILSON of the Arnold Arboretum; PRESIDENT HERBERT HOOVER in his former capacity as Secretary of the Department of Commerce; DR. G. S. JAMIESON and DR. E. J. WHERRY of the Bureau of Chemistry; DR. W. E. SAFFORDof the Bureau of Plant Industry; MR. H. C. FLEITMAN of Tallahassee; and DR. L. E. BARNETTE, PROF. CHAS.ABBOTT, and C. C. CONCANNON of the U. S. Department of Commerce. H. RAYNESand the Florida started with the work of the late WILLLAM late DR. TENNANT RONALDS of Tallahassee. To this list must be added the AMERICAN TUNGOIL CORPORATION and MR. L. P. MOORE to whom great credit is due for the commercial development of the industry. No one can examine the history of any of the more lately introduced plants without being impressed by the activities of the OFFICE OF FOREIGN + SEED AND PLANT INTRODUCTION of the United States Department of Agriculture. It appears to the author that the value of this office to the agriculture of the United States is sadly underestimated. The amount of effort necessary to introduce and establish a plant in the United States is enormous. The natural conservatism in American agriculture is a dead weight that must always be overcome before new rural industries can he developed. The tung-oil industry is only one of many that owe their existence to the untiring and adventurous efforts of DR. DAVID FAIRCRILD and his associates. For the preparation and coloring of the photographs accompanying this article, I am indebted to MISS FWWERSand DR. H. KURZof the Florida State College for Women.
Universal Indicator. A universal indicator which gives the colors of the spectrum from orange-red to reddish violet at pH 3-11.5 has been described in the Pherm. We&Mod (1928, volume 65, pp. 12461249). The composition is as follows: Methyl orange 0.1 g., methyl red 0.04 g., bromthymol blue 0.4 g., phenolphthalein 0.5 g., naphtholphthalein 0.32 g., aesolphthalein 1.6 g., made up with ether to 100 cc.-Chew. Age
