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.[5][100][101] The mounted police were viewed favorably by park patrons and were later incorporated into a permanent patrol.[5] The regulations were sometimes strict.[101] For instance, prohibited actions included games of chance, speech-making, large congregations such as picnics, or picking flowers or other parts of plants.[101][102][103] These ordinances were effective: by 1866, there had been nearly eight million visits and only 110 arrests in the park's history.[104]