Thus, by transplanting a small section of a mouse tumor into other mice, the small transplanted fragments will in two weeks grow to the size of filberts, and each of these will furnish material to engraft upon ten mice.

These new tumors are similar in character to the original tumor, and really represent parts of it in the same way that all the Baldwin apples in the world are parts of the original tree which was found in Baldwinville many years ago, and as all the Concord grape vines are really parts of the original vine.

It has been estimated that if all the growth capacity of this mouse tumor were availed of by the successive inoculation of other mice, a mass of tumor several times the diameter of the sun would grow in two years.
The condition of the individual seems to exert no influence upon the growth of the tumor.

Growth may be as rapid when the bearer is in a condition of extreme emaciation as it is when the bearer is well nourished and robust.
[Illustration: FIG 14 .-- PHOTOGRAPH OF A MICROSCOPIC PREPARATION FROM A CANCER OF THE UTERUS.

A large mass of cells is extending into the tissue of the uterus which is shown as the fibrous structure.