Planets inhabitable, I, 100, 102.

Plato, I, 5.

Platt, H., I, 126, 126.

Playfair, J., I, 233.

Pletho, G., I, 188.

Pliny, II, [280].

Ploucquet, I, 336, 337.

Poe, E. A., II, [132].

Poincaré, I, 136.

Poisson, I, 292; II, [2].