In 1900 I published a short paper on the geologic work of ants in the tropics.2 Since then a good many additional observations, notes, and photographs have been made, and the most important of them are here brought together in a single article.
There are many brief notes on the work of ants scattered through the writings of travelers in tropical countries, but these notes are for the most part repetitions of rather vague and sensational stories which make no claim to accuracy of statement, so that they would add little or nothing to the value of the article. No attempt has, therefore, been made to use such notes except in so far as they seem to afford new or important corroborative evidence. At the same time it is realized that some of the things that ants do in tropical countries are so remarkable that those who have no . . .