great numbers under a sheltering stone, when the rain came up and surrounded us. XIV THE EMIGRANTS I have already told how on the top of Mont Ventoux, some 6000 feet above the sea, I had one of those pieces of entomological good luck, which would be fruitful indeed did they but occur often enough to allow of continuous study. Unhappily mine is a unique observation, and I despair of repeating it. Future observers must replace my probabilities by certainties. I can only found conjectures on it. Under the shelter of a large flat stone I discovered some hundreds of Ammophila hirsuta, heaped in a mass almost as compact as a swarm of bees. As soon as the stone was lifted all the small people began to move about, but without any attempt to take wing. I moved whole handfuls, but not one seemed inclined to leave the heap. Common interests appeared to unite them indissolubly. Not one would go unless all went. With all possible care I examined the flat stone which sheltered them, as well as the soil and immediate neighbourhood, but could discover no explanation of this strange assemblage. Finding nothing better to do, I tried to count them, and then came the clouds to end my observations and plunge us into that perplexing darkness I have already described. At the first drops of rain I hastened to put back the stone and replace the Ammophila people under shelter. I give myself a good mark, as I hope the reader also will, for having taken the precaution of not leaving the poor things, disturbed by my curiosity, exposed to the downpour.