Their wave-
lengths are between 5774 and 5390. It is such a distinct
absorption spectrum that it is possible to determine with
certainty that the fluid actually contains a certain substance,
even though the microscope might fail to give sure proof. Blood--
human blood--that was what those stains were."
He paused. "The spectra of the blood pigments," he added, "of the
extremely minute quantities of blood and the decomposition
products of hemoglobin in the blood are here infallibly shown,
varying very distinctly with the chemical changes which the
pigments may undergo."
Whose blood was it? I asked myself. Was it of some one who had
visited the tomb, who was surprised there or surprised some one
else there? I was hardly ready for Kennedy's quick remark.
"There were two kinds of blood there. One was contained in the
spots on the floor all about the mausoleum. There are marks on the
arm of Dana Phelps which he probably might say were made by the
teeth of my police-dog, Schaef. They are human tooth-marks,
however.
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