Carriage exercise in Yucatan is no joke. It is not the gentle fiction, the make-believe of exertion played at by indolent women and invalids, to which we are accustomed. The doctor who ordered it would lie under the grave suspicion of being in league with the local undertaker. The invalid who took it would need nothing further save a shelter in the nearest cemetery. The most inveterate Oliver Twist would not "ask for more." It is all the fault of the roads and natural selection. The roads are unspeakable, and they have evolved an unspeakable vehicle. None but a carriage which has lost all respect for itself and its passengers could survive an hour on a Yucatecan road. The Yucatecan road is not meant for carriages. It is meant for chamois goats and those black ants which have plenty of time on their hands, and consider that the only way round a blade of grass is to climb up one side and down the other. Time is really what you want on a Yucatecan road. You have got to take it quietly and pick your way. But this is not the programme of the Yucatecan carriage. It is always in a hurry. It is a hurry-skurrying, give-you-no-time-for-repentance desperado of a conveyance. It takes you in and does for you. It blacks your eyes, breaks your ribs, bruises you. It gives you "bloody noses and cracked crowns." It does not care. It has nothing to lose. It is made of huge wheels, stout poles and rough cord, with a rabbit-hutch on top swinging on the cords. You go inside the rabbit-hutch and you try to stop inside. The carriage tries to get you out. That's the game. You can play it as long as you like, as long as you have a bone unbroken or a breath in your body. The carriage does not mind. It is always there, and the rocks in the roads are always there; and the two-inch long thorns on the hedges are always there to scratch your eyes out. So that all day long you can play at carriage exercise in Yucatan until you are reduced to a bruised and bleeding mass. This demon vehicle is called a _volan coche_ (flying coach). It is quite indigenous and home-grown. It is not even known in Mexico, where the roads are bad but have not reached that pitch of villainy to which the Yucatecan roads have attained. It is drawn by three mules abreast, the centre one in the shafts. When they come to a very large boulder and the wheels stick, they pull, pull all they know, and very slowly the wheel of the volan climbs that boulder, reaches the summit, tips you to an angle of forty-five degrees on the non-boulder side, and then comes down with a sickening thud over the precipice edge of the boulder and, if you are not careful, shoots you through the rabbit-hutch side. Nobody need suffer from liver in Yucatan. A little carriage exercise, and the most rebellious liver which ever made a hell on earth for a mortal would "come to heel."