Bartram was a farmer, but his interest in plants, shrubs and trees was such that he became one of the greatest botanists of his day. In autumn, when his farm labors were finished for the year, he journeyed extensively about the colonies, gathering specimens with which to beautify his grounds. His greatest enjoyment in life was to make his collection of rare species ever more complete, and his remarkable accomplishments in this direction, despite many handicaps, entitle him to be known as the father of American botanists. After Bartram's death his son William, also an eminent botanist, carried on the work, and later his son-in-law, Colonel Carr, did likewise until the place became one of the most interesting botanical gardens in the country. In 1851 the estate was purchased by Andrew Eastwick, a railway builder just returned from an extended commission in Russia, who erected a large residence in another part of the grounds. In 1893 the city bought Bartram House and its immediate grounds and in 1897 acquired the balance of the estate, the whole being converted into a public park and the old house being furnished and put in excellent condition by the descendants of the Bartram family. Undoubtedly the most notable instance of the use of "brick" stone with the so-called Colonial or "barn" pointing is the Johnson house at Number 6306 Germantown Avenue, Germantown. Typical of the first homes that lined the street of this historic old town for nearly two miles, it is solidly built of dark native ledge stone, the front being of dressed rectangular blocks considerably smaller, somewhat rougher and hence less formal than the surfaced blocks of Cliveden, for example. It is a single gable-roofed structure two and a half stories high with ranging windows throughout, a large chimney at each end and two dormers in the front between them. Like many others of the time it had a small penthouse roof at the second-floor level which, with the overhanging eaves of the roof above, afforded protection from rainy weather for the joints of the stonework which was at first laid up in clay. Lime for making more permanent mortar was far from plentiful for many years after America was first settled, and numerous makeshifts had to be resorted to unless the builder could afford to import lime from England at great expense. Over the doorway, with its simple flanking seats, there is the familiar pedimental and slightly projecting hood, while the door itself is of the quaint divided type, permitting the upper half to be opened while the lower half is closed. On the first floor the windows have nine-paned sashes, both upper and lower, together with nicely paneled shutters, while on the second floor the upper sashes are foreshortened to six panes, and there are neither shutters nor blinds.