8 
of aniline dyes, we are able to examine and follow the life history 
of animals or plants, entirely unknown to previous generations : 
by its use the medical man is better able to arrive at a right 
diagnosis, and hence, better able to cope with the disease he 
almost daily comes in contact with. Its value in the detection of 
adulteration, too, is very great. Whether it be silk, woollen goods, 
or cotton, that is under examination, the microscope speaks with 
no uncertain sound, while the important part it plays in the ex- 
amination of foods is such, that were the microscope withdrawn, 
the Adulteration Act would almost become a dead letter. 
Again, to the scientist, who has to assist the authorities in 
the detection of crime, the microscope is all powerful as an im- 
plement of research, whether he has to determine if a drop of 
blood, be human, or otherwise, or whether some subtle poison is 
the thing to be discovered and detected. To still further assist 
him, the scientist has called to his aid the Photographic Art, to 
be used in conjunction with the microscope and to illustrate 
how both may be applied, I cannot do better than quote portions 
of an article by T. C. Hepworth, which appeared in “ Chambers’ 
Journal ” a short time since. 
The subject of the paper is the result of work done by Dr. 
Paul Jeserich of Berlin. 
The first criminal case brought forward, was one in which 
the liberty of a suspected man literally “ hung upon a hair,” 
for by a single hair was he tracked; the case was one of assault, 
and two men were suspected of the deed; a single hair was found 
upon the clothing of the victim. This hair was _photo- 
micrographed. One of the suspected men, whom we will call 4, 
had a grey beard, and a hair from his chin was treated in the 
same manner, the difference in structure, tint, and general ap- 
pearance wasso marked, that the man was at once liberated. 
The hair of the other man B, was also examined, and but little re- 
semblance was discovered to that found on the victim. The 
original hair was now carefully scrutinised, and compared with 
other specimens, 
The photograph clearly showed that the hair was pointed, 
and that it had never been cut, gradually the conclusion was ar- 
rived at, that it belonged to a dog, an “ old yellow smooth haired, 
and comparatively short haired dog.” 
Further inquiry revealed the fact that B owned such a dog, a 
fresh hair from this animal agreed in every detail with the original 
photograph, and the man was convicted. He subsequently con- 
fessed that he alone had committed the crime. 
