Fig. 13.—Potholes in Intermittent Stream Course.
Architectural forms are not confined to the United States, nor to the American continent. The Giant's Causeway in Ireland is a familiar example of what they have in those parts, while under the Arabian sky the conditions resemble those in our arid Southwest, and there we find many fantastic rain carvings. Among these is the Sphinx of El Guerrah, carved by the rain-sculptor doubtless expressly to furnish answers to our "whys and wherefores" concerning this "wondrous architecture of the world."
Among the applications proposed for the newly liquefied gases is their use as aids in balloon navigation. An aëronaut having a few bottles of liquefied hydrogen or illuminating gas has the means of increasing the inflation of his balloon when necessary, and need not fear to waste a little gas when he wishes to diminish its levity. Prof. L. Errera, of Brussels, has suggested an apparatus which he calls the ceinture de natation, or natation belt, by which these objects can be conveniently accomplished.
[THE HERDS OF THE YELLOW ANT.]
By JAMES WEIR, Jr., M. D.
As far as my observations go, and they extend through a period of twenty years, the aphides which live on grapevines, and which are the peculiar cows of the common yellow ant (Lasius flavus) of our gardens, show many curious phases in their life history. Especially is this true of the manner in which they perpetuate their species.