1. Its fumes, being heavier than air, penetrate the burrows and promptly poison or Asphyxiate all living animals and fleas.: A tablespoonful poured on a cow-chip and rolled down a dog hole will Asphyxiate the entire family.: Compression of the vagus nerve may slow the child's pulse and Asphyxiate it through lack of oxygen in the blood.: When version has been done haste may compress the head in