Although Banneker had by this time begun to ingratiate himself into the favor of the very best element in his community solely through his demonstration of mental superiority, he did not permit his unusual popularity and his love of study to render him any less helpful to his father in the cultivation of the farm. He proved himself to be just as industrious in farming as he was diligent in studying. When his father died in 1759, leaving to Benjamin and his mother, as joint heirs, the dwelling in which they lived, together with 72 acres of land,[155] Benjamin was fully prepared to assume control of affairs on the estate, and make it yield a comfortable living for him and his mother. His father had divided the remaining 28 acres of the original farm among the three daughters who also survived him. His farm was said to be one of the best kept farms in his neighborhood. It was well stocked, containing a select assortment of fruit trees, a fine lot of cattle, and a specially successful apiary. Young Banneker's diligent reading of the books at his command served to develop his mental powers rapidly, giving him a retentive memory, correct forms of speech and a keen power of analysis. This faculty grew largely out of his special fondness for the study of mathematics, by which he acquired unusual facility in solving difficult problems. He early won the reputation of being the smartest mathematician not only in his immediate neighborhood but for miles around. He was often seen in the midst of a group of neighbors whom he constantly astounded by the rapidity and accuracy with which he would solve the mathematical puzzles put to him. This caused such widespread comment that he frequently received from scholars in different parts of the country, desiring to test his capacity, mathematical questions, to all of which, it is said, he responded promptly and correctly.[156] His close attention to the study of mathematics led him easily into the quest of some practical form by which to give tangible expression to his thought. It is highly probable that this fact can explain the facility with which he planned and completed at the age of thirty a clock which stands as one of the wonders of his day.[157] "It is probable," says one, "that this was the first clock of which every portion was made in America; it is certain that it was as purely his own invention as if none had ever been before. He had seen a watch, but never a clock, such an article not being within fifty miles of him."[158] He completed this clock with no other tools than a pocket knife, and using only wood as his material. It stood as a perfect piece of machinery, and struck the hours with faultless precision for a period of 20 years.