Mr. Bernard having dined from home, the children had not, till they met round the tea-table in the evening, an opportunity of telling him how pleasantly they had spent their morning, and how much information their mother had given them respecting the habits of the swallow tribes. "But even now," added Edward, "I do not feel quite satisfied with regard to their migration. Pray, papa, what is your opinion upon that subject?" _Mr. B._ I am decidedly of opinion that they do migrate, my dear. The internal structure of such animals as continue during winter in a torpid state, is peculiar: both the formation of the stomach, and the organs of respiration, differ from such as are constantly in a state of activity and vigour. Mr. John Hunter, one of our most celebrated English anatomists, dissected several of these birds, but did not find them in any respect different from the other tribes; from which he concludes the accounts of their turpitude to be erroneous. Now, although I feel no doubt myself, that such instances have occurred, yet I by no means believe them to be frequent. Indeed, a particular friend of mine, a skilful navigator, tells me he has not infrequently seen, when many hundreds of miles distant from shore, large flights of these birds; and that his ship has often afforded the poor little travellers a most seasonable resting-place, in their toilsome journeys. "Oh, well papa," said Edward, "if a friend of yours has really seen them, I can believe they do migrate; but I do not like to give up an enquiry, till my mind is satisfied upon a subject." _Mr. B_. Within certain restrictions, your resolution is good, Edward; but if you can believe nothing but what I, or some friend of mine, can attest from our own observation, your incredulity will deprive you of much valuable information. The great advantage of reading is, that it enables us to gain instruction from the observation of others, on subjects beyond the reach of our own experience. _Edward._ Very true, papa: but do you not think that many authors make mistakes, and put things in books that are not facts? _Mr. B._ I do, my dear boy; and I always endeavor, when I meet with a difficulty, to consult a variety of authors upon the same subject, and, by this means, generally find I can discover the truth. "In future I will endeavour to do so too, papa," said Edward, "and will not allow my doubts to prevent my improvement; for I am sure I am at present very ignorant. Every day, and almost every hour, I meet with something that I do not understand--something that surprises me. Papa, you have read, and thought, and seen so much, I should think you would never meet with any thing new."