One of the first, and possibly the most successful, of the buggy type machines is that made by the Hols-man Automobile Company, of Chicago. Our illustration shows the power plant used on this car, and its simplicity is apparent from a glance at the photograph. As can be readily seen, the engine is of the double-opposed-cylinder type, having two air-cooled cylinders with the usual cast flanges. The bore and (Continued on page 340.).