It was the Mexican war that first aroused Lowell to the seriousness of the extension of slavery, and it was meeting a recruiting officer in the streets of Boston, "covered all over with brass let alone that which nature had set on his countenance," which inspired his writing the first of the "Biglow Papers." They were hastily and carelessly written, and Lowell himself held them in slight estimation as literature; but they became immediately popular, as no poetry had that he had published previously. Their freshness and directness appealed to the manliness and good sense of the average New Englander, and the whole community responded to them with repeated applause. There is, after all, much poetry in the Biglow Papers, the more genuine because unintentional; but they are full of the keenest wit and a proverbial philosophy which, if less profound than Emerson's, is more capable of a practical application. The vernacular in which they are written must have been learned at Concord,--perhaps on the front stoop of the Middlesex Hotel,--while Lowell was listening to the pithy conversation of Yankee farmers, not only about their crops and cattle, but also discussing church affairs and politics, local and national. It was the grandfathers of these men who drove the British back from Concord bridge, and it was their sons who fought their way from the Rapidan to Richmond. With the help of country lawyers they sent Sumner and Wilson to the Senate, and knew what they were about when they did this. For wit, humor, and repartee,--and, it may be added, for decent conversation,--there is no class of men like them. Both Lowell and Emerson have testified to their intrinsic worth. On one occasion a Concord farmer was driving a cow past Sanborn's school- house, when an impudent boy called out, "The calf always follows the cow." "Why aren't you behind here, then?" retorted the man, with a look that went home like the stroke of a cane. If Lowell had been present he would have been delighted. The Yankee dialect which he makes use of as a vehicle in these verses is not always as clear-cut as it might be. He says, for instance, "Pleasure doos make us Yankee kind of winch As if it was something paid for by the inch." The true New England countryman never flattens a vowel; if he changes it he always makes it sharp. He would be more likely to say: "Pleasure does make us Yankee kind er winch, as if 'twas suthin' paid for by the inch." There are other instances of similar sort; but, nevertheless, if the primitive Yankee should become extinct, as now seems very probable, Lowell's masterly portrait of him will remain, and future generations can reconstruct him from it, as Agassiz reconstructed an extinct species of mammal from fossil bones.