The agreement which Lowell had with the _Standard_ left him at liberty to send either prose or poetry, and as his prose had not necessarily a direct reference to the anti-slavery contest, so his poetry was to be independent of any polemic consideration. It was Lowell the writer whom Gay wished most to attach to the paper for the added weight and influence he would bring, and Lowell in making and holding to his agreement was not indifferent to the gentle stimulus which a regular engagement afforded. He was to send something on Friday if possible, on Saturday at any rate, of each week, and when the end of the week came, a sudden suggestion might turn him away from a half-finished article to let loose a poem in its place. The first five “Biglow Papers” were published in the _Courier_, the last four in the _Standard_, where also appeared, early in the connection, that poem entitled “Freedom,” which holds the essence of Lowell’s thought on this large subject, and is the best expression of the attitude of his mind as he entered with a certain sense of special enlistment upon the direct business of a crusade against slavery. The suggestion came from the revolution in France which swept Louis Philippe from his throne, and from that light blaze of revolutionary fire which for a moment kindled hopes in Germany and Italy. During this time appeared also several poems which reflected with varying lights the thought that stirred in him at the new birth, as it seemed, with which humanity was travailing. Such are the apologue of “Ambrose,” that grim poem “The Sower,” “Bibliolatres,” “A Parable,” but here also were “Beaver Brook,” first called “The Mill,” occasionally a poem like “Eurydice” which had been lying unprinted in his portfolio, and a few bits of rhymed satire which were thrown off by him on the spur of the moment, and were too careless in manner to be worth his gathering later into his volumes.