F. Galton—Address before the British Association. 271 
contrary, it is easy and sound; they have also excellent appe- 
tites. But hypocrisy is a very common vice; and all my in- 
formation agrees in one particular, as to the utter untruthful- 
ness of criminals, however plausible their statements may ap- 
pear to be. 
we are entitled to say is, that the prevalent instincts of each 
idual. A man 
gress on the subject, I was enabled to examine the many thon- 
sand photographs of criminals that are preserved for purposes 
of identification at the Home Office, to visit prisons and confer 
with the authorities, and lastly to procure for my own private 
statistical inquiries a large number of copies of photographs of 
einous criminals. I may as well say, that I begged that the 
photographs should be furnished me without any names at- 
tached to them, but simply classified in three groups according 
to the nature of the crime. The first group included murder, 
manslaughter, and burglary; the second group included felony 
and forgery; and the third group referred to sexual crimes. 
The photographs were of criminals who had been sentenced to 
long terms of penal servitude. : 
By familiarizing myself with the collection, and continually 
sorting the photographs in tentative ways, certain natural 
classes began to appear, some of which are exceedingly well 
