"In 1719 he reported before the Royal Society some experiments which he had lately made on the effect of the sun’s warmth in raising the sap in trees. ...[T]he Society... requested him to continue his research. [Peter Collinson ] writes, "...Hales complied with great pleasure, and on the 14th of June, 1725, he exhibited a treatise in which he gave an account of his progress." At the request of the Society this treatise was published an appeared in 1727 under the following title: "Vegetable Staticks...""