PHOTOGRAPHY UNDER DIFFICULTY 
tributary twenty metres wide, a deliciously beautiful 
stream, flowed gracefully into the Arinos on the right side 
from the northeast. 
We made our camp at the junction of the two streams. 
The camp was extremely bad. It was already late in 
the evening and we could find no more suitable spot. We 
had gone that day eighty-three kilometres. I was quite 
satisfied with the progress we had made during the last 
few days. During the evening I made an excursion on 
foot along the tributary river to the northeast for several 
kilometres, but I found nothing of particular interest. 
During the night we received another visit from an 
anta } but the pachyderm again escaped before my men 
had time to kill it. We heard cries of Indians in the 
distance. My men were in a great state of mind for fear 
we should be attacked. I sat up the entire night in order 
to be ready in case of emergency. 
I took that opportunity of computing and checking 
many of the astronomical observations I had taken, and 
developing a great number of photographic glass plates. 
In my experience I have found that the fears people 
have of spoiling negatives unless one is shut up in an 
absolutely dark room are quite exaggerated. On that 
particular occasion, for instance, and on many previous 
and subsequent occasions, I developed the glass plates 
— and I think with satisfactory results — out in the 
open, with merely the fly-leaf of the tent sheltering me 
overhead so as not to have the direct rays of the stars 
shining upon the photographic plates. Indeed, there was 
light enough coming in around the tent for me to see 
quite plainly what was going on outside. I simply covered 
up the developing trays as an extra precaution, and 
seldom, in fact, never, spoiled a negative in process of 
development. 
I also found developing tanks quite serviceable when 
a great number of negatives had to be developed quickly. 
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