The Planetismal Hypothesis

Abstract

As there is a rising tide adverse to the planetismal hypothesis, may I record the following observation in its favour? Looking at the moon with a 9½-inch reflector, I saw details of the structure of the great south wall of the crater Hommel; the circular fault is perfectly fresh, and the rock exposed is a giant conglomerate, the boulders several hundred yards in diameter, with cavernous spaces between. In moments of perfect pellucidity, my instrument is quite capable of defining objects half a mile in diameter. My observation confirms Pickering's at Arequipa, when he was looking at the fault-scarp of the Sinus Iridium, in the opposite quadrant.