the world. According to Olmsted, the park was "of great importance as the first real Park made in this country—a democratic development of the highest significance". Construction Construction of Central Park's design was executed by a gamut of professionals. Frederick Law Olmsted and Calvert Vaux were the primary designers, assisted by board member Andrew Haswell Green, architect Jacob Wrey Mould, master gardener Ignaz Anton Pilat, and engineer George E. Waring Jr. Olmsted was responsible for the overall plan, while Vaux designed some of the finer details. Mould, who worked frequently with Vaux, designed the Central Park Esplanade and the Tavern on the Green building. Pilat was the park's chief landscape architect, whose primary responsibility was the importation and placement of plants within the park. A "corps" of construction engineers and foremen, managed by superintending engineer William H. Grant, were tasked with the measuring and constructing architectural features such as paths, roads, and buildings. Waring was one of the engineers working under Grant's leadership and was in charge of land drainage. Central Park was difficult to construct because of the generally rocky and swampy landscape. Around of soil and rocks had to be transported out of the park, and more gunpowder was used to clear the area than was used at the Battle of Gettysburg during the American Civil War. More than of topsoil were transported from Long Island and New Jersey, because the original soil was neither fertile nor sufficiently substantial to sustain the flora specified in the Greensward Plan. Modern steam-powered equipment and custom tree-moving machines augmented the work of unskilled laborers. In total, over 20,000 individuals helped construct Central Park. Because of extreme precautions taken to minimize collateral damage, five laborers died during the project, at a time when fatality rates were generally much higher. During the development of Central Park, Superintendent Olmsted hired several dozen mounted police officers, who were classified into two types of "keepers": park keepers and gate keepers. The mounted police were viewed favorably by park patrons and were later incorporated into a permanent patrol. The regulations were sometimes strict. For instance, prohibited actions included games of chance, speech-making, large congregations such as picnics, or picking flowers or other parts of plants. These ordinances were effective: by 1866, there had been nearly eight million visits and only 110 arrests in the park's history. Late 1850s In late August 1857, workers began building fences, clearing