FOR THE USE OF PUBLIC ANALYSTS, HEALTH

OFFICERS, SANITARY CHEMISTS,

AND FOOD ECONOMISTS.

BY

ALBERT E. LEACH, S.B.,

Late Chief of the Denver Food and Drug Inspection Laboratory, Bureau of Chemistry,
U. S. Department of Agriculture; Late Chief Analyst of the Massachusetts
State Board of Health.

REVISED AND ENLARGED BY

ANDREW L. WINTON, PH.D.,

Chemist in Charge of Food Investigations, Bureau of Chemistry,
U. S. Department of Agriculture,

THIRD EDITION, SECOND THOUSAND.
TOTAL ISSUE, SIX THOUSAND.

NEW YORK

JOHN WILEY & SONS, INC.
LONDON: CHAPMAN & HALL, LIMITED

1914

13.60

2.2

HARVARD UNIVERSITY
EMGINEERING SCHOOL

HARVARD
UNIVERSITY
LIBRARY

COPYRIGHT, 1904, 1909.

BY

ALBERT E. LEACH.

First Edition Entered at Stationers' Hall.

COPYRIGHT, 1913.

BY

MRS. MARTHA T. LEACH.

THE SCIENTIFIC PRESS
ROBERT DRUMMOND AND COMPANY
BROOKLYN, N. Y.

AFFECTIONATELY DEDICATED TO THE MEMORY OF

Charles Pomeroy Worcester,

FORMER ANALYST OF THE MASSACHUSETTS STATE BOARD OF HEalth,

WHOSE LOVABLE PERSONALITY AND STERLING INTEGRITY WERE

A CONSTANT INSPIRATION DURING MANY YEARS

OF CLOSE COMPANIONSHIP TO

THE AUTHOR.