"Old Faithful 311. Thompson July 27, 1932 does not look safe to me. A better fence or wire entanglement should be put in for the present or if this is to be the permanent station then a high concrete ramp should be put around 3 sides of the audience. This afternoon Ralph & I tried ammonia in a pyrene gun on about 12 bears & cubs. The bears were frightened in every case & ran away, but they paid no attention to the ammonia. If ever returned to the car in a few minutes. The experiment appears to be a total failure. I intend to try it again tomorrow. From Old Faithful to Thumb to Mammoth. July 28, 1932 The experiment with the Pyrene gun & ammonia. Ten more bears were sprayed, making a total of 22. 5 of them were sprayed only once. 4 of them were sprayed 3 times each. 1 of them was sprayed twice. In each instance they were frightened and ran a short distance away. In a few cases they shook their heads and appeared to undergo.