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This wild Rabbit has been startled by some noise, and the next moment she may be scampering away to her burrow, with the little bunnies, at the top of their speed, and crouch there until all is quiet again. Rabbits usually select, if possible, a sandy soil overgrown with furze, in which to make their burrows, as such a soil is easily removed, and the dense prickly furze hides their retreat, whilst it affords them a wholesome and never-failing food. These furze bushes are constantly eaten down, as far as the rabbits can reach standing on their hind legs, and consequently present the appearance of a solid mass with the surface even and rounded. These animals retire into their burrows by day to rest, and come out only in the twilight to obtain food.

There is little wonder, then, that we have known practically nothing of the Apache and their customs beyond the meagre record of what has been given us by a few army officers; consequently their study was entered into with especial interest. Although much time was expended and much patience consumed before the confidence of their elders was gained, the work was finally successful, as will be seen particularly by the creation legend and the accompanying mythologic picture-writing on deerskin, which give an insight into the mode of thought of this people and a comprehensive idea of the belief respecting their genesis. Not satisfied with the story as first related by the medicine-men lest error perchance should have crept in, it was repeated and verified by others until no doubt of its entire accuracy remained. It is especially fortunate that the chief investigations were made in the summer of 1906, when the new "messiah craze" was at its height, thus affording exceptional opportunity for observing an interesting wave of religious ecstasy sweep over this primitive folk.

Let us take for example one of the 240 horse-power Babcock & Wilcox boilers here in the University. The height of the columns may be taken as 4½ feet, measuring from the surface of the water to about the center of the bundle of tubes over the fire, and the head would be equal to this height at the maximum of circulation. We should, therefore, have a velocity of 8(4½)^{½} = 16.97, say 17 feet per second. There are in this boiler fourteen sections, each having a 4-inch tube opening into the drum, the area of which (inside) is 11 square inches, the fourteen aggregating 154 square inches, or 1.07 square feet. This multiplied by the velocity, 16.97 feet, gives 18.16 cubic feet mingled steam and water discharged per second, one-half of which, or 9.08 cubic feet, is steam. Assuming this steam to be at 100 pounds gauge pressure, it will weigh 0.258 pound per cubic foot. Hence, 2.34 pounds of steam will be discharged per second, and 8,433 pounds per hour. Dividing this by 30, the number of pounds representing a boiler horse power, we get 281.1 horse power, about 17 per cent, in excess of the rated power of the boiler. The water at the temperature of steam at 100 pounds pressure weighs 56 pounds per cubic foot, and the steam 0.258 pound, so that the steam forms but 1/218 part of the mixture by weight, and consequently each particle of water will make 218 circuits before being evaporated when working at this capacity, and circulating the maximum weight of water through the tubes.

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