1052 REPORT OF THE HARVARD AFRICAN EXPEDITION 
for negatives to dry. In one region I had to wait until a slight clearing of the 
skies on the fourth day, before I could pack my films. In the second place, 
one must guard against flies and dust. With well hardened films this is not so 
important but in very warm weather it may become necessary to hang a net 
over the films to keep insects off. 
All in all I found comparatively little trouble during the entire trip in de- 
veloping about 1200 still pictures and a little over 5000 feet of the 15,000 ft. 
of moving picture film exposed. The remainder of this was developed in the 
United states after the return of the Expedition with no apparent deteriora- 
tion due to storage. 
For keeping the negative after drying I used the Eastman Kodak books 
with an individual waxed paper envelope for each negative. The negatives 
themselves can be numbered on the corner with the description or identifi- 
cation in the index. 
For carrying and protecting this outfit I found that hard fiber cases were 
the lightest and most durable. These I had made to order to fit the various 
contents. 
So much for the equipment and methods which were found to be quite 
simple yet adequate for the needs of the expedition. 
In retrospect I feel safe in saying that photography in Africa is really a 
comparatively simple matter provided one takes a few precautions. After all, 
the heat is not sufficiently great to produce too abnormal conditions, and al- 
though the dampness occasionally becomes a nuisance, it can be overcome 
without too many difficulties. There was one factor, however, which surprised 
me. Knowing that the light values in photography increase as one approaches 
the equator, I expected that I would be able to use very short exposures when 
taking pictures in the sunlight. In consequence I underexposed my first set 
of pictures badly. This indicated that the light was not as powerful as I had 
supposed. But that was not the end, for when I developed the first lot of nega- 
tives taken on a dark, rainy day, I found them decidely overexposed. From 
this I learned that there was relatively little difference between sunshine and 
rain as far as the photographic intensity of the light was concerned, and fur- 
thermore, that it was possible to get negatives when normally one would have 
considered it too dark. 
The only other major difficulty I was brought face to face with was the 
reproduction of copper-colored skin lesions on negroes. This I never did solve, 
and for the most part the change in skin pigmentation has remained unfilmed 
and only in the memory of its observers. 
