ASSOCIATION OF OFFICIAL AGRICULTURAL CHEMISTS
BOX 290, PENNSYLVANIA AVENUE STATION,

WASHINGTON, D. C.

COPYRIGHT, 1921,

BY

THE ASSOCIATION OF OFFICIAL AGRICULTURAL CHEMISTS

Double Moisture Determinations in Fertilizer Materials. By J. O. Clarke.
Report on Testing Chemical Reagents. By C. O. Ewing..
Report on Microanalytical Methods. By B. J. Howard.

CONTENTS

PROCEEDINGS OF THE THIRTY-FOURTH ANNUAL CONVENTION,

NOVEMBER, 1917.

Officers, Referees, Associate Referees and Committees of the Association of Official

Agricultural Chemists, for the Two Years Ending November, 1919...

Members and Visitors Present, 1917 Meeting.

President's Address. By J. K. Haywood..

MONDAY-MORNING SESSION.

Report on Crude Fiber. By C. K. Francis...

Report on Stock Feed Adulteration. By B. H. Silberberg.

Report on Water in Foods and Feeding Stuffs.

A New Method for Moisture Determination.

Hutchins....

By J. O. Clarke.

PAGE

By G. F. Lipscomb and W. D.

55

57

59

60

MONDAY-AFTERNOON SESSION.

The Effect of Mass and Degree of Fineness on the Percentage of Available Phos-

phoric Acid in Precipitated Phosphate. By H. D. Haskins.

Report on Nitrogen. By H. D. Haskins and I. K. Phelps.

Report on the Study of the Effect of Glass Wool in the Ferrous Sulphate-Zinc-

Soda Method for Nitrates. By I. K. Phelps..

The Use of Permanganate in the Kjeldahl Method Modified for Nitrates. By I. K.

Phelps..

Investigation of the Kjeldahl Method for Determining Nitrogen. By I. K.
Phelps and H. W. Daudt..

Report on Potash. By T. D. Jarrell.

A Modified Method for the Determination of Water-Soluble Potash in Wood

Ashes and Treater Dust. By H. D. Haskins.

Report on Water. By J. W. Sale..

Technique of Determination of Soil Phosphorus. By H. A. Noyes.

Determination of Moisture in Field Samples of Soil. By H. A. Noyes and J. F.

Trost...

A Study in Soil Sampling. By William Frear and E. S. Erb.

Excavation Method for Determining the Apparent Specific Gravity of Soils. By

William Frear and E. S. Erb..

103

Nitrogenous Compounds in Soils. By J. K. Plummer.

106

Report on the Lime Requirement of Soils. By W. H. MacIntire.

108

Determination of Calcium in the Presence of Phosphates. By J. F. Breazeale.

124

Report on Insecticides and Fungicides. By O. B. Winter..

Report on Coloring Matters in Foods. By W. E. Mathewson.