202 THE AMERICAN MONTHLY [July 
MICROSCOPICAL MANIPULATION. 
THE DIFFERENTIATION OF HUMAN AND ANIMAL BLOOD 
BY THE AID OF A SPECIFIC SERUM.—HE. Ziemke refers to 
investigations of Wasserman, Schutze and Uhlenhuth, 
who have shown that by injecting rabbits with human 
blood a change is produced in the rabbit’s serum, made 
evident by the fact that when added to dilute human 
blood a turbidity is caused, which does not appear with 
the blood of any other animal except the monkey, and de- 
scribes some further tests he has made to determine the 
_ applicability of the reaction for forensic purposes. Posi- 
tive results were obtained with fresh blood, dried blood, 
blood stains on cloth, blood in garden soil, blood from a 
person poisoned with carbonic oxide, blood or steel im- 
plements, blood from the wall of a cellar, blood on wood, 
blood in glass, blood on paper, the blood of a three-day- 
old corpse and putrid blood. The stains in several in- 
stances were ten or more years old, and where possible, 
control tests were made on the blood of the common do- 
mestic animals. In every case except one a positive re- 
sult was obtained with the human blood preparations, 
while the animal tests were all negative; the one fail e 
is attributed to the fact that the stain tested, which dated 
back to 1883, did not yield any extractive to the soda so- 
lution in which it was soaked.—Wedical Record. 
METHOD OF DISTINGUISHING HUMAN BLOOD FROM THAT 
or ANIMALS.—C. Tarchetti (Gazz. degli Osped. May 19th, 
1901) describes a new procedure for this purpose: If 
into an animal (A) the blood of a different species (B) is 
injected, then after a certain time the blood of the ani- 
mal (A) is found to be toxic towards blood of the species 
(B). Thus, by repeated injections into rabbits of human 
blood—10 c.cm. or four or five occasions at intervals of 
about a week—Uhlenhuth and Washermann got from the 
blood of the rabbit a serum which exhibits hemotoxic 
