In the gallop of the dog the sequence of foot falling and the action of the body is materially different, and the animal is free from support twice in each stride. [Illustration: THE GALLOP OF THE DOG.] Assuming that a racing hound after a flight through the air with elongated body and extended legs (like the conventional galloping horse), lands upon the left fore foot, the right fore will next touch the ground; from this he will again spring into the air, and with curved body and flexed legs land upon the right hind foot, while the right fore feet will be half the length of the body to the rear. The left hind now descends, another flight is effected, and again the left fore repeats its functions of support and propulsion. These successive foot fallings are common to all dogs when galloping, and it is worthy of note that the same rotary action in the use of the limbs is adopted in the gallop of the elk, the deer and the antelope, all of which animals, like the dog, can for a time excel the horse in speed. A search through all the dictionaries published at the time of writing, and accessible to the Author, fails to discover a correct definition of "the gallop." This motion is in America frequently miscalled the "run," and its execution "running," but no corresponding explanation of the word is given by any lexicographer. In Scott's "Lady of the Lake" occurs "Then faint afar are heard the feet of rushing steeds in _gallop_ fleet," many other distinguished Authors refer to the same action by the same name, by which, or its equivalents, it is universally known in Europe. THE LEAP. There is little essential difference in general characteristics of either of the several movements that have been described, but with a number of experiments made with horses while leaping, no two were found to agree in the manner of execution. The leap of the same horse at the same rate of speed, with the same rider, over the same hurdle, disclosed much variation in the rise, clearance, and descent of the animal. A few phases were, however, invariable. While the horse was raising his body to clear the hurdle, one hind foot was always in advance of the other, which exercised its last energy alone. On the descent, the concussion was always first received by one fore foot, followed more or less rapidly by the other, sometimes as much as 30 inches in advance of where the first one struck; the hind feet were also landed with intervals of time and distance. No attempt will be made to analyze the consecutive phases of various other acts of Animal Locomotion, such as rearing, bucking, kicking, tossing, etc., on account of the irregularity which characterizes their execution, and the difficulty of obtaining reliable data.