In considering the general influence of the horse and its kindred forms on human culture, we clearly perceive that we are now attaining a time when the machinery of civilization is to depend in a much less degree than of old on the help which these creatures give to man. Even fifty years ago the horse was far more necessary to the work of our kind than it is at present. Going back a hundred years, we perceive that the population of the civilized world could not possibly have been maintained, if by some disease all the horses had been swept away. Such a calamity in the year 1800 would have led to the depopulation of almost all the cities of the interior country, famine would have ravaged our States, and the whole economic system of society would have had to be reconstructed. Now the greater part of the work which of old had to be done by horses, can, at a slight increase of cost, be effected by mechanical engines. Ploughing, except on steep hillsides and in very stony ground, can be cheaply and effectively done by steam. The same agent can propel the harvesters and work the threshing machines. Even farmers who till fields of no great extent find it desirable to do much of their work by steam-engines, for the reason that fuel is less costly than horse feed. An interesting instance to show how far mechanical inventions have taken the place of horsed wagons in the work of civilized communities was afforded by the horse distemper which swept over the country in 1872. During the week or more in which this epidemic was at the worst, the State of Massachusetts was practically unhorsed, yet the greater part of the necessary business, that required to bring provisions to the town, was effected by means of the railways. The same incident shows, however, in another way, how absolutely necessary this animal is, in certain parts of our work. For the great Boston fire, which occurred at that time, was doubtless due to the fact that, owing to the sickness of the horses, an effort was made to drag the engines by hand-power, with the result that they came upon the ground so slowly as to give the fire a chance to become an uncontrollable conflagration.