Charles Lamb's most sportive essays, which read as though they came almost spontaneously from his pen, are known to have been the result of intense brain labor. He would spend a whole week in elaborating a single humorous letter to a friend. Lamb was so sensitive concerning proof-reading as to be the dread of the printers. It is said of the poet-laureate of England that he has been known to re-write a poem twenty times and more before he was satisfied to give it to the printer. Dickens, when writing a book, was accustomed to shut himself up for days together, and to work with fearful energy until the task was completed; after which he would come forth presenting the appearance of a person recovering from a fit of illness. The free-and-easy spirit which characterizes his pages affords no evidence of the travail through which their author passed in giving them birth. Bulwer-Lytton took matters much more philosophically. He always worked at pen-craft leisurely, never more than three or four hours a day; and yet by carefully observing a system the aggregate of his productions was very large. Balzac, after thinking over a subject, would retire to his study and write it out half a dozen times before he gave the manuscript to the printer, whom he afterwards tormented to the very verge of exasperation by his proof alterations. To come nearer to our own time, we may remark that Longfellow, whose versification seems always to have flowed with such ease and fluency from his pen, was a slow and painstaking producer, sometimes altering and amending until the original draft of an essay or poem was quite improved out of sight. Dr. Channing nearly drove his printers crazy; after his manuscript--almost illegible by corrections and interlineations--had been returned to them with alterations, omissions, and additions on the first proof-sheets, he would ponder over, alter, and amend three or four successive proofs before he finally allowed the result to meet the public eye,--a new edition involving another series of alterations. The lyric which cost Tennyson the most trouble was "Come into the Garden, Maud." It is said to have been held back from the public after it had been a year in his hands, going through repeated processes of alteration. What time indorses, requires time to create and finish. To this determination of Tennyson to condense all his thoughts into the smallest space, and never to expand when by patient labor he can contract, we owe the few lines in which he states in the "Princess" the whole nebular theory of the universe as expounded by Kant and Laplace; and how much reflection must have been required to condense the description of the fundamental defect of English law, on which volumes have been written, as he has done in "Aylmer's Field:"-- "The lawless science of our law, That codeless myriad of precedent, That wilderness of single instances."