166 PHOTO-MICROGRAPHS. 
erable time. Thus portions of integument re- 
moved from one person or from an amputated 
limb may be transplanted to an open wound upon 
the surface of the body of another. Fingers 
which have been accidentally severed may be 
replaced, and sometimes become reattached. But 
the most remarkable example of this kind among 
warm-blooded animals is furnished by an experi- 
ment of Professor Martin, of Johns Hopkins 
University. This distinguished teacher and ex- 
perimentalist has succeeded in keeping the heart 
of a dog alive for several hours after the body was 
dead. For this experiment the animal, deeply nar- 
cotized, is quickly dissected in such a manner that 
the heart and lungs are completely detached from 
the rest of the body, the large blood-vessels being li- 
gated, except those which go to and from the lungs. 
Artificial respiration is kept up by means of bel- 
lows introduced into the trachea (wind-pipe), and 
the heart is supplied through a rubber tube with 
blood drawn from another animal. Under these 
conditions, its rhythmical contractions have con- 
tinued for five hours. 
In cold-blooded animals, the heart may con- 
tinue to contract for hours when completely 
detached from the body, without any special pre- 
cautions being taken to supply it with oxygenated 
blood. 
These facts show that the popular idea that 
death of the whole body occurs at the instant 
that respiration ceases, “when the breath leaves 
the body,” is fallacious. 
