GEOLOGICAL PHOTOGRAPHY 107 
gets enthusiastic about a hobby or a study he soon 
finds others who have similar interests. Sometimes 
you may see in the columns of scientific and natural 
history journals advertisements of collectors who 
are willing to arrange exchanges. 
I advise you to cultivate the art of sketching, 
and to make sketches of geological strata, as well as 
drawings of fossils. You will find that the very act 
of sketching makes you notice little details that 
might easily be overlooked. And you can make 
a very interesting collection of sketches and draw- 
ings which will prove useful to yourselves and 
others. : 
Personally, I never set out on a geological ex- 
cursion without a photographic camera, and I have 
managed to collect a great number of photographs 
illustrating the geological features of the different 
places I have explored. Ii you possess cameras, 
take them with you on all your excursions. I do 
not favour hand-cameras for Nature-work; you 
cannot hold them steady long enough for the ex- 
posures that are usually needed. for geological 
photography nothing beats a stand camera; at 
least, that is the conclusion I have come to after 
many years’ experience. If you can get a room to 
yourselves in which to form your museum, you can 
add to its interest by decorating the walls with en- 
larged photographs of fossils and rocks. Ii you want 
to interest your friends, why not make some lantern- 
slides, and give them an exhibition and a nice little 
talk ? In trying to teach others you will improve 
yourselves. 
Surely you cannot fail to enjoy geology and 
