PREFACE PRIMARILY, the expedition described in the following pages was an exploration of a genuine terra incognita. While it is true that the Pinacate region was known to a few Papago Indians and perhaps half a dozen Mexicans, to the reading and thinking world it was totally un-known and the more we gathered maps and inquired about it, the less we knew. On all available maps the space around the Pinacate dot was a blank, and usually the dot itself was far out of place. There was not a soul who knew enough about the country to say lava. Naturally, the animal and plant life of the Pinacate region was as much unknown as its geography hence our combination of botanist, zoologist, sportsman, and geog- rapher. In any wild country, that is a good hand to draw to, and with the three jolly good fellows whose company I shared, I could enjoy exploring any country this side of the Styx. Indeed, I would take my chances with them beyond it. Ever since it was my good fortune to see the Rocky-...