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THE POPULAR SCIENCE MONTHLY. 



readily made when the American locality is the one actually observed, 

 as the others have long been known, and quite thoroughly studied 

 and described. The maps of the three great geyser-regions present 

 the best comparative view of them. Expressed in figures, the areas 

 within which the springs are included are as follow : 



Square miles. 



Iceland 5,000 



New Zealand 2,500 



Yellowstone National Park 3,5*78 



In the southern Iceland region, which includes the Haukadal lo- 

 cality, there are about six areas or groups of hot springs, which are 

 from forty to fifty miles apart. In New Zealand there are some ten 

 groups, the greatest distance between them being about fifteen miles. 

 In the Yellowstone National Park, there are from thirty to forty lo- 

 calities or groups, some quite close together, and others sixteen miles 

 apart. In Iceland only three of the areas have geysers of note. In 

 the Yellowstone Park eight, at least, have good spouters, and New 

 Zealand has fully as many localities. The following table compares 

 some of these groups. It should be premised, however, that the indi- 

 vidual groups included under the Yellowstone Park are not a portion 

 of the thirty or forty localities just enumerated, but subdivisions of 

 some of them. The Upper Geyser Basin and the Lower Geyser Basin 

 of Firehole River are really comparable with the Haukadal area, and 

 yet the first two comprise respectively 2,560 acres and 19,200 acres. 



In the number of springs and noted geysers, the Yellowstone 

 National Park and New Zealand far exceed Iceland, in which " The 

 Great Geyser " and Strokhr are the only two prominent spouters. As 

 to the number of springs in New Zealand, there are no definite data, but 

 they appear to be numerous. In the Yellowstone Park, over two thou- 

 sand springs have been enumerated and mapped, and among them are 

 seventy-one geysers, of which twenty are known to spout to a height 

 of not less than fifty feet. Of course, in each of the three countries, 

 there are hot springs outside of the areas as here indicated ; and, if 

 these are taken into account, the American localities will exceed the 

 others, especially if the California and Nevada springs are counted. 



