_Strokr_ is another hot spring with a tube ten feet in diameter and over forty feet deep. In former days it was most accommodating and would always give an exhibition of its powers if a couple of bushels of turf were thrown into the tube. The response came in from five to forty minutes. It usually threw out the turf and ejected a column of water upwards of a hundred feet. Again and again would it hurl out the boiling water until its underground system was exhausted. Some years since a party of gentlemen, French I believe, desirous of obtaining an extra high spout threw many stones into the tube on top of the turf. The geyser siphon was doubtless broken or at least fractured so that superheated steam can not be stored, for _Strokr_ spouts no more. It boils furiously all the time with dense clouds of steam and the water rises and falls in the tube in the most violent manner. In looking into the tube one is impressed with the idea that there are safer places, as it seems if _Strokr_ were about to mount into the sky to challenge _Geysir_ which has so long held the palm. _Geysir_ is the main attraction. The first mention of this phenomenon in literature is in the History of Norway written by _Saxo Gramaticus_, who lived between 1150 and 1206, so that it has been active for over seven centuries. It has built for itself a mound of geyserite many feet above the level of the plain and has the appearance of an inverted oyster shell in its series of terraces. This mound increases with each eruption by the addition of a film of salts held in solution in the boiling water. The spring is in the form of a saucer with the inward sloping side at an angle of thirty degrees. The diameter of this saucer is nearly seventy feet and the saucer is a true circle. Within a saucer there is a depression at the bottom, a ring to hold the cup. Within the center of _Geysir’s_ saucer there is an opening, ten feet in diameter, which extends straight down to the depth of eighty-four feet. Beyond this the plumb will not go. Whether there are deeper ramifications of tubes or not is a matter of conjecture unless the explanation of geyser action above offered is correct. Again, the shape of _Geysir_ is that of a funnel, i. e. a tube running downward from a flaring reservoir at the top. During the irregular periods between the eruptions, the water wells upwards in the center and overflows the rim of the basin through a foot square opening in the side. This opening has been shaped by the farmer of _Haukadalr_ to confine the escaping hot water to one channel. The water is heavily charged with minerals in solution. An English analysis of a gallon of the water yielded the following:— Sodium carbonate, 5.56 grains Aluminum oxid, 2.80 ” Silica, 31.38 ” Sodium chlorid, 14.42 ” Sodium sulfate, 8.57 ” ----- Total solids, 62.73 ”