It is important to observe that Miller here expressly fits into his scheme the work of the six days. In another passage he remarks that it is specifically his task, as a geologist, to account for the operations of the third, fifth, and sixth days, and this circumstance has occasioned the mistake, which has crept into so respectable a work as Smith's 'Dictionary of the Bible,' that he did not profess to explain the creative proceedings of the first, second, and fourth days. In the passage we have quoted he assigns to each successive day its distinctive character and work. The entire scheme, then, may be thrown into a single sentence. A beginning of formlessness and fire, indefinite in duration; a first and second day, not discriminated by Miller from each other, during which light, though created, did not reach, the surface of our planet, but gradually struggled through the thick enveloping canopy of steam rising from a boiling ocean; a third day, in which an enormous development of vegetable life took place, a development due in part to the warm and humid atmosphere, which no clear sunbeam could as yet penetrate; a fourth day, marked by the emergence of sun, moon, and stars in unclouded splendour, but by no striking phenomena of organic life; a fifth day, in which the most imposing features in the creative procession were sea-monsters and birds; and a sixth day, in which huge mammals crowded the stage of existence, and man appeared. Each of these days is, of course, supposed to have occupied an indefinite number of years.