Deuteronilus, [259-261].

Development of canals, latitudinal law of, [299], [302], [375];

follows melting of polar caps, [302], [338-340];

across equator, [373], [375].

Devonian era of the earth, [141].

Diaphragm, the great, [265].

Diplopia, [196].

Djihoun, narrowest double, [228-230];

embouchure of, [219-220];

connection with Luci Ismenii, [260], [262].