'"As amongst pigeons, so amongst horses, there are tumblers. The feat is, however, performed differently, and varies considerably in its effect on the performers. As the pigeon executes this without anything on its back, so the horse seldom achieves it without somebody upon his. To the latter, therefore, we must give the greatest share of merit, who ventures to perform upon a hard road what the other does only in the air, without even a cloud to brush against. The one preferring, it seems, the Milky, and the other the Highway. '"Among horses, I have never discovered a pouter; but I have had a fine puffer. The noise he made, however, and particularly when at his business, was not pleasant; and I let a neighbour have him cheap, who had a good three-stall museum, and a very heavy vehicle to draw; so that in all weathers he might enjoy the entertainment of his very extraordinary qualifications. [Illustration: THE TUMBLER, OR ITS AFFINITIES.] '"It is well known that there is a horse that is called a carrier, so there is a pigeon likewise. But as it may not be known to every one, I must inform you that from very long observation, I find the pigeon is the most expeditious of the two. '"I am, sir, your very humble servant, '"BENJ. BUFFON." 'ADVICE TO WOULD-BE HORSEMEN. 'I have given you the hints contained in my previous letters supposing you are at home enough on horseback to ride out alone, and may possibly be tempted to travel the road, as either the lucre of gain, or the _universal passion_, as a celebrated author calls the love of fame, may send you forth. 'Let me entreat you to examine your tackling well at setting out, particularly from an inn and after dinner. See that your girths are tight; many a good fall have I got by not attending to this. Ostlers are too apt to be careless, and ought never to be paid till we see them the next time.[7] An instance of a singular nature occurred at Huntingdon a few years since to the Rev. D. B., of Jesus College, in Cambridge, which has given a discovery to the world (productive, indeed, of a paper war), but which may turn out beneficial to mankind, as it proves 3 to be equal to 4. [Illustration: HOW TO RIDE A HORSE UPON THREE LEGS.]