Now, with the window shut, the boys seemed safe enough for the present. They could see that the big snake was extremely uneasy.  As the wind whistled by him, his great tail twisted and untwisted, and he seemed to be trying to get a better hold on the smooth surface, while his beady eyes glared at them only a moment in the glow of the flashlight, and then he transferred his attention to the landscape below them.  His forked fangs darted in and out during this time with the angriest lightning-like movement.