LETTER OF TRANSMITTAL.

CONTENTS.

ILLUSTRATIONS.

INTRODUCTION.

CHARACTER OF PRODUCTS. FIRST-CLASS PRODUCTS.

LABELS.

MANUFACTURING EXPERIMENTS WITHOUT THE USE OF PRESERVATIVES. OUTLINE OF THE EXPERIMENTS.

EXPERIMENTS WITH PRESERVATIVES. SODIUM BENZOATE.

STUDY OF PENICILLIUM IN KETCHUP.

HISTOLOGICAL STRUCTURE OF KETCHUP.

MICROSCOPIC EXAMINATION OF SOME COMMERCIAL BRANDS.

SUMMARY.

FOOTNOTES:

Issued January 9, 1909.

U. S. DEPARTMENT OF AGRICULTURE,
BUREAU OF CHEMISTRY—BULLETIN No. 119.
H. W. WILEY, Chief of Bureau.

EXPERIMENTS ON THE SPOILAGE
OF TOMATO KETCHUP.

BY
A. W. BITTING,
INSPECTOR, BUREAU OF CHEMISTRY.

WASHINGTON:
GOVERNMENT PRINTING OFFICE.
1909.