Walter Esplin Mason, Dogs of all nations (1915)
“ Sharp and shrill the farmer’s whistle pierces the keen mountain air, and ever and anon, as though by magic, the little white dots begin to move and converge towards a common center. In response to one signal the sound of the dog’s answering bark can be heard; another signal and he drops as though shot, and is as silent as the grave. In the dim distance a few small dots can be seen; they are some stragglers that have been overlooked; a whistle galvanizes them also into motion, but in the wrong direction ”
