As he added the serum from the inoculated rabbit, a cloudy milky ring formed almost immediately in the hitherto colourless, very dilute blood-solution.
"That," concluded Craig, triumphantly holding the tube aloft, "that conclusively proves that the little round spot on the hardwood floor was not paint, was not anything in this wide world but blood."
No one in the room said a word, but I knew there must have been someone there who thought volumes in the few minutes that elapsed.
"Having found one blood-spot, I began to look about for more, but was able to find only two or three traces where spots seemed to have been. The fact is that the blood spots had been apparently carefully wiped up. That is an easy matter. Hot water and salt, or hot water alone, or even cold water, will make quite
