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Cocoa-butter is the substance generally chosen for cheap soluble pessaries, because it is easily obtainable, and has what is called a sharp melting point that is, it dissolves or melts very suddenly and readily at body-heat, but is solid below that heat. Research and experiment have proved conclusively that no spermatazoa indeed, no microbes or germs of any kind can pass through a film of oil.
This is what makes the hair on a dog's or a cat's back stand up when he is angry; but the commonest use of the movement is, when animals are cold, to make their coats stand out so as to hold more air and retain the body-heat better.
The temperature usually dropped below zero, but every opportunity was taken during these fine, sunny days to partially dry our sleeping-bags and other gear, which had become sodden through our body-heat having thawed the snow which had drifted in on to them during the blizzard. The bright sun seemed to put new heart into all.
But after I had been standing in it for a while, ten minutes maybe, a clear space had formed around my body, and I could see the ground. The heat of my body helped the air to redissolve the mist into steam. And as I watched, I noticed that a current was set up. The mist was continually flowing in towards my feet and legs where the body-heat was least.
It could see quite well, even in the close darkness of the starless night; its eyes were of a nature capable of perceiving infrared radiations as light. There were plenty of these; the jeep's engine, lately running on four-wheel drive, was quite hot. Had he been standing alone, especially on this raw, chilly night, Verkan Vall's own body-heat would have lighted him up like a jack-o'-lantern.
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