This sign appeared at the time indicated in the prophecy, "immediately after the tribulation of those days;" or as Mark has it, "in those days, after that tribulation." On May 19, 1780, the sun was darkened, and the following night the moon did not give her light. Whatever explanation men may have to offer as to the cause of the phenomenon, the fact remains that when the time of the prophecy came, the sign appeared. The first volume of the "Memoirs of the American Academy of Arts and Sciences," published in Boston in 1785, contains a paper entitled, "An Account of a Very Uncommon Darkness in the States of New England, May 19, 1780. By Samuel Williams, A.M., Hollis Professor of Mathematics and Philosophy in the University at Cambridge [Massachusetts]." Of the extent, duration, and degree of darkness on that occasion, this scientific observer said: "The extent of this darkness was very remarkable.... From the accounts that have been received, it seems to have extended all over the New England States. It was observed as far east as Falmouth [Portland, Maine]. To the westward, we hear of its reaching to the furthest parts of Connecticut, and Albany. To the southward, it was observed all along the seacoasts. And to the north as far as our settlements extend.... "With regard to its duration, it continued in this place at least fourteen hours: but it is probable this was not exactly the same in different parts of the country. The appearance and effects were such as tended to make the prospect extremely dull and gloomy. Candles were lighted up in the houses; the birds having sung their evening songs, disappeared, and became silent; the fowls retired to roost; the cocks were crowing all around as at break of day; objects could not be distinguished but at a very little distance; and everything bore the appearance and gloom of night." (See pages 234-246.) Whittier has commemorated it in the poem, "Abraham Davenport:" "'Twas on a May day of the far old year Seventeen hundred eighty, that there fell Over the bloom and sweet life of the spring, Over the fresh earth and the heaven of noon, A horror of great darkness.... "Birds ceased to sing, and all the barnyard fowls Roosted; the cattle at the pasture bars Lowed, and looked homeward; bats on leathern wings Flitted abroad; the sounds of labor died; Men prayed, and women wept; all ears grew sharp To hear the doom blast of the trumpet shatter The black sky." The words of the poet are substantiated by the plain prose of the dictionary maker. In the department explanatory of "Noted Names," Webster's Unabridged Dictionary (edition 1883) says: