CLARENCE J. WEST AND CALLIE HULL 13 



Phenols: 



Alkali-insoluble phenols. O. M. Brewster, Pullman, Wash. 88 entries. 



1881-1910. 

 Phosphates: 



Acid phosphates and superphosphates. A. Marshall, 3043 St. Paul St., 

 Baltimore, Md. Entries by subject. 1880-date. 



Manufacture and uses of dicalcium phosphate. The Grasselli Chemical 

 Co., Cleveland, Ohio. 21 entries. Abstracts included. 



Phosphate deposits. Eliot Blackwelder, 317 Railway Exchange Bldg., 

 Denver, Colo. 415 entries by author and title. Many abstracts in- 

 cluded. 80 per cent complete. 



Soluble phosphates. Engineering Societies Libraries, New York, N. Y. 

 52 entries. 1878-1917. Abstracts included. 



The Western phosphate field. G. R. Mansfield, U. S. Geological Survey. 

 Washington, D. C. 160 entries, by author. Many abstracts included. 

 60 per cent complete. To be published later. 

 Phosphoric Acid: 



Patents on phosphoric acid and its salts. William H. Ross, Bureau of 

 Soils, Washington, D. C. 404 entries, by author, title and patent num- 

 ber. Covers whole period of U. S. Patent Office. 



Phosphoric acid. Engineering Societies Libraries, New York, N. Y. 



81 entries. 1876-1918. Abstracts included. 

 Phosphorus: 



Engineering Societies Libraries, New York, N. Y. 83 entries. 1879- 



1917. Abstracts included. 

 Photochemistry: 



Action of light on organic compounds, visible spectra with few references 

 to ultra-violet spectra. H. M. McLaughlin, Iowa State College, Ames, 

 Iowa. 332 entries, by author and subject. 1850-1921. 



Chemical action of light. Clarence J. West, National Research Council, 

 Washington, D. C. 2000 entries by author. One-half complete. 



Light: theory of photochemistry and biological effects. S. C. Brooks, 

 Hygienic Laboratory, 25th and E Sts., N. W., Washington, D. C. 

 Entries by author and subject. Up to 1918 and occasional later en- 

 tries. Abstracts usually included. 60 to 70 per cent complete. 



Photosynthesis and allied subjects. H. A. Spoehr, Carmel, Calif. 450 



entries, by author, 1797-1922. 95 per cent complete. 

 Photography: 



Physics and chemistry concerned with photography. Research Labora- 

 tory, Eastman Kodak Co., Rochester, N. Y. June 1915-date. Printed 

 cards, covering all leading periodicals. Abstracts included. 

 Phthalic Acid: 



Mono-nitro- and monamino-o-phthalic acids. M. T. Bogert, Columbia 

 University, New York, N. Y. Over 100 entries, chronological by sub- 

 ject. Up to 1903. Abstracts included. Practically complete. 

 Piscatorial Chemistry: 



Biological, physiological, and technological chemistry of fishes. Harden 

 F. Taylor, Bureau of Fisheries, Washington, D. C. Several hundred 

 entries, by subject. No effort made to include all material found in 

 Chemical Abstracts. 



Chemistry of fish flesh. Lloyd H. Almy, Bureau of Chemistry, Washing- 

 ton, D. C. 150 entries. Very complete to 1915. Abstracts included. 

 Pitch Coke: 



Pitch coke for carbon electrodes. The Barrett Co., 40 Rector St., New 

 York, N. Y. 82 entries, by author and subject. 1873-date. Ab- 

 stracts included. 

 Plant Chemistry: 



Effect of nitrates on plants. H. G. MacMillan, Greeley, Colo. 396 

 entries, by author. 1882-date. Abstracts included in part. 



Salt absorption and mineral nutrition of plants. R. B. Harvey, Univer- 

 sity Farm, St. Paul, Minn. 575 entries, by author and subject. Up 

 to date. Abstracts included in many cases. Nearly all references com- 

 monly available. 



See also Soils (Eaton) ; Tobacco (Gross) . 



