slower than the eye, [273];

stars the peculiar province of, [273], [274].

Canals, [11], [32], [163];

discovery of, [24], [26];

considered straits, [27];

regularity of, [28], [29];

unnatural in look, [173];

manner of introduction of, [174];

conditions necessary to seeing of, [174-177], [282], [283];

pencil-like lines, [177], [179], [367];