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LETTER OF TRANSMITTAL.

U. S. DEPARTMENT OF AGRICULTURE,

BUREAU OF CHEMISTRY, Washington, D. C., May 18, 1908. SIR: I submit herewith for your consideration and approval the manuscript of a preliminary report on the changes in food products kept in storage, especially at low temperatures. These investigations have been carried on in harmony with the will of Congress as specifically expressed in the several appropriation bills of the last few years. The objects of the studies are fully stated in the introduction to the present report, now offered for publication as Bulletin 115 of the Bureau of Chemistry.

Respectfully,

Hon. JAMES WILSON,

Secretary of Agriculture.

H. W. WILEY,

Chief of Bureau.

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ILLUSTRATIONS.

PLATE I. Fig. 1.—Outer shell membrane of fresh egg. Fig. 2.-Inner shell
membrane of fresh egg

II. Fig. 1.-Yellow yolk of fresh egg. Fig. 2.-White yolk of fresh egg
III. Fig. 1.-Yellow yolk of fresh egg, hardened in situ. Fig. 2.-
Rosette crystal found in yolk of cold-storage egg..

IV. Chicken after storage at 13° F. from December 24, 1903, to February
6, 1908.

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V. Chicken, massaged and made as flexible as possible, without soaking,
after storage at 13° F. for about four years

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VI. Normal chicken muscle. Fig. 1.-Longitudinal section. Fig. 2.

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Transverse section

VII. Breast muscle of chicken in cold storage fourteen months. Fig. 1.-
Longitudinal section. Fig. 2.-Transverse section.....
VIII. Thigh muscle from chicken in cold storage fourteen months, showing
invasion of fiber by bacteria. Fig. 1.-Longitudinal section.

Fig. 2.-Transverse section ....
IX. Unsoaked breast muscle of chicken in cold storage two years.

Fig. 1.-Longitudinal section. Fig. 2.-Transverse section...
X. Soaked breast muscle of chicken in cold storage two years. Fig. 1.-
Longitudinal section. Fig. 2.-Transverse section...

XI. Breast muscle of chicken in cold storage four years. Fig. 1.--Longi-
tudinal section showing vacuolated degeneration. Fig. 2.-Longi-
tudinal section showing varied and extensive degeneration...

XII. Small intestine of fresh chicken

XIII. Small intestine of chicken six months in cold storage

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