GEOLOGICAL SURVEY OF THE TERRITORIES. 



53 



The hot spring's and geysers of the Yellowstone and Madison were 

 so fully described last year, and are, ^vitll considerable detail, noticed iu 

 the present report by Dr. Peale and Professor Bradley, that I have given 

 them but little attention, I will refer, however, for a moment, to a few 

 illnstrations,.and among them the fine one which I am permitted to use 

 in this report by the courtesy of the editors of the Illustrated Christi;in 



Weekly. The cuts were engraved from photographs taken by Mr, Jack- 

 son, of the survey, during the summer of 1871. The "Hot Spring Cone" 

 we called the "'Fish-Pot," from the fact that it extended out into the 

 lake several feet, so that one could stand on the siliceous mound and 

 hook the trout from the coldwaters of the lake, and, without moving, 

 boil them in the steaming-hot water of the spring. There seemed to 

 be no connection between the orifice of the Hot Spring and the cold 

 water around. In the upi.er right-hand corner is the Castle Geyser, 



