226 THE BORDERLAND OF SCIENCE. 



there were ever any glaciers on the moon is full of 

 interest. For if there were glaciers there must have 

 been snow and rain, as well as wind currents to bear 

 the moisture-laden air against the slopes of the lunar 

 mountain ranges. It will be well, therefore, to 

 indicate the evidence which Frankland finds for the 

 lunar glaciers of his theory. " What may we expect 

 to see ? ' he says. 4 Under favourable circumstances 

 the terminal moraine of a glacier attains enormous 

 dimensions; and consequently, of all the marks of a 

 glacier valley, this would be the one most likely to be 

 first perceived. Two such terminal moraines, one of 

 them a double one, have appeared to observers to be 

 traceable upon the moon's surface.' His description 

 of the position of these would not be intelligible 

 without a lunar chart ; but students of the moon will 

 understand where to look for them when we mention 

 simply that one lies near the end of the remarkable 

 streak from Tycho* to Bullialdus, crossing this streak 

 exactly opposite Lubiniezky, while the other lies at the 



* Tycho is that spot where the full moon shows a gathering together 

 of streaks, somewhat as at either core-end of a peeled orange. Indeed, 

 small photographs of the full moon look so much like photographs of a 

 peeled orange that, as "Wendell Holmes notes, many persons suppose 

 astronomers have substituted the orange for the moon, so as to save 

 themselves trouble. Imagine how pleasing such an idea must be to our 

 De la Hues, Rutherfurds, and others, who have exhausted the con- 

 trivances of mechanical ingenuity to make their great telescopes truly 

 follow the moon, and have devised at infinite labour the best photo- 

 graphic appliances to secure good results. It is only right to Bay, 

 however, that no one would for a moment mistake the masterpieces of 

 these astronomers for photographs of a peeled orange, since they are 

 equal in distinctness to views of the moon with excellent telescopes. 



