a Eee 
9 
In the identification of blood stains, several difficulties occur, 
it is easy for the microscopist to tell whether the blood submitted 
for examination is that of a mammal, of a bird, or, of a fish, for 
the corpuscles of each have distinct characteristics, but when we 
ask him to differentiate between the blood corpuscles of the 
different kinds of mammals, he is somewhat at a loss, because his 
only guide is that of size. 
Thus, the blood corpuscles of the elephant, are, as might be 
expected, larger than those of any of the other mammalia, but 
they are in other respects, like those of man, round in outline. A 
dog, or pig, possesses corpuscles of a smaller size ; while those of 
the goat, are very much smaller still. 
Dr. Jeserich says : A murder had been committed, and D. 
was the man suspected, suspicion being strengthened by the 
circumstance, that an axe belonging to him was found smeared 
with blood, which had been partially wiped off. The man denied 
his guilt, and accounted for the blood-stained weapon, which he 
declared he had not taken the trouble to wipe, by saying he had 
that day killed a goat with it. The blood was examined micro- 
scopically and the size of the corpuscle proved his statement to 
be false. A photo-micrograph of it, as well as one of goat’s 
blood was prepared, in order that the judge and jury might make 
a comparison. Another photo-micrograph was made from part 
of the blade of the axe, which showed, very clearly, by unmistake- 
able streaks, that the murderer had done his best to remove the 
traces of his crime. This last case shows the value of the instru- 
ment for the confirmation, as well as the detection, of crime. 
The next section of the work, treats of the detection of falsi- 
fication of hand writing and figures, by means of photography in 
conjunction with the microscope. 
The microscope alone, will not aid much, although we can de- 
tect by it places in the paper where erasures have been made, it 
is also possible, by its aid, to ascertain whether an alteration has 
been made in a word before the ink first applied has become dry, 
or whether the amendment has been an after thought. : 
In the former case, the previously applied ink, will, more or 
less, amalgamate with and run into the other, as will be clearly 
seen under the microscope, while in the latter case, each ink mark 
will preserve its own unbroken outline. 
Such, ladies and gentlemen, are a few of the revelations of the 
instrument I have endeavoured to interest you in, and in thanking 
you for your kind attention to-night, we hope your interest may 
continue and that we may all have a successful session. 
