The kind of machine should obviously be adjusted to the conditions, as, for example, the size of the farm, and the character of the farming. Riding plows may be desirable on level land, but where it is necessary to plow up and down hill, walking plows should be used. The extra weight of the wheel plow is not a serious matter on level land, because the sliding friction has been transferred to rolling friction, but no mechanical device has been or can be invented which will decrease the power necessary to raise a given weight a given height. The various machines requiring horse power should be adjusted, as far as possible, to require the same number of horses. If the main unit is three horses, then, as far as possible, all machines should require three horses, such as plows, harrows, manure spreaders, harvesters, etc. If the activities of the farm are sufficient to require six horses then some of the tools may require three horses each, while others require a pair. [Illustration: Mr. R. H. Garrahan, Kingston, Pa., is one of the most successful growers of celery in the United States. After graduating from the Wyoming Seminary he spent one year studying horticulture at the Pennsylvania State College. For several years he was assistant in horticulture at the University of Tennessee. He now has at Kingston 60 acres under intensive cultivation. His principal crops are celery, asparagus, cabbage, tomatoes and onions.] [Illustration: H. H. Richardson, Brooklyn Heights, Ohio, agricultural graduate, Ohio State University, 1892. Fourteen years ago inherited 35 acres of land and an indebtedness of $1,750. He has raised a family of four children, has what is seen in the picture plus the land and $6,000 invested elsewhere. Mr. Richardson has held some local public office continuously during the past ten years, being at present member of school and water boards, member of advisory board of bank, secretary of Cleveland Fruit and Vegetable Growers' Association and Ohio vice-president of the National Vegetable Growers' Association.] A farm with six work horses is rather a desirable one from several aspects. Among other things, it enables the farm owner to employ two men who can perform most of the team work with two three-horse teams, while at other times three pairs of horses may be arranged when the owner needs to use a team. This leaves the farmer time to attend to many activities not requiring horses, and time to plan the work and to look with more care after the purchases and sales. The size of such a farm will depend entirely on the nature of the activities. If it is a so-called general farm with a minimum of live stock, it would, perhaps, consist of from 150 to 180 acres of tillable land with some additional pasture and woodland. Ideally, every farm should have sufficient activity to make it something of a center. It should be an organism. It is difficult to organize one man.