ISOLATED EFFECTS OF BEAUTIFUL PROPORTIONS. 409 



moving at a certain rate of speed, more and more possible and neces- 

 sary. It is rightly said, at the present day, that time is- money. It 

 is preferable to lessen the weight and multiply the number of animal 

 motors to eifect large transportations, and compensate, by the distance 

 travelled over, the expense and maintenance of a larger number of 

 animals. Heavy horses whose weight reaches 900 and 1000 kilo- 

 grammes will very soon be a rarity ; they are reserved for~ hauling 

 those heavy burdens which can be moved only at a walk ; their high 

 price, besides, bears witness to the difficulty of their production and 

 to the competition carried on against them by the lighter varieties. 

 Among the latter it has been attempted to establish a sort of happy 

 medium by the combination of the principal elements of 'the heavy 

 draught-horse with those of horses which possess considerable speed. 

 The two factors of the quantity of movement, mv, supposing that they 

 be comparable at all, have been practically calculated in such a manner 

 that one of them should not, in the product, predominate over the 

 other. This problem, so complicated in its material realization, has 

 been resolved with much sagacity by our French breeders ; we have 

 as evidence those magnificent specimens of our Percheron race, of the 

 Breton race along the coast, and even the Boulonnais horse, which 

 large manufacturing concerns use so extensively all over the country. 



The principal distinction between the mixed motor and the two 

 preceding is a mass relatively large, supported by a strong and almost 

 slender set of members; the former is the elements of strength 

 (volume of muscles) acting upon the machinery of speed (length and 

 direction of the bony segments). The body, less voluminous, less close 

 to the ground than that of the slow, heavy draught-horse, is more 

 powerful and more muscular than that of the race-horse ; the members, 

 longer and their bones more inclined than those of the first, are, on the 

 contrary, shorter, less oblique than those of the second. 



Strictly speaking, two types of conformation may be recognized 

 in the category of mixed motors : the one, light draught-horses, finer, 

 more energetic, and more active, especially resemble coach-horses ; the 

 other, fast, heavy draught-horses, which are more common, heavier, and 

 slower, would, on the contrary, have more affinity with the slow 

 draught-horse. In each of these cases the habitual gait is the ordinary 

 trot, but the short trot of a speed almost below the mean for animals 

 whose weight approaches. 700 kilogrammes ; it is a little more elon- 

 gated for those whose weight is close to 500 kilogrammes. 



We cannot indicate in a precise manner the conformation of the 

 mixed motors on account of the numerous varieties which they present. 



