Pierius, [71].

Polar caps, phenomena of, [37], [41], [61];

key to comprehension of planet, [37];

compared with those of earth, [41], [46];

composition of, [39], [161], [168], [339];

making of new, [94];

position of, [68];

aspect of, [56], [57];

maxima and minima of, [38], [41-44], [47-53], [55-57], [66-68], [162];

fission of, [61].