In the school year 1919-1920 the number of pupils who attended the public schools was 591,798. The number of teachers was 18,873. Because of good schools and of compulsory school attendance, there were in 1910, only 113,502 illiterates, or persons of ten years of age and over who could not read or write, or 5.6 per cent of the total population. Of these illiterates, 93,000 were of foreign birth and less than one per cent were of native white parentage. State normal schools for the training of teachers are located at Trenton, Montclair, Newark, and Glassboro. City normal schools are maintained for the same purpose by Jersey City, Paterson, Trenton, and Camden. The state maintains summer schools for the preparation of teachers and makes appropriations to the State Agricultural College, a department of Rutgers College at New Brunswick. Special schools maintained by the state are: Farnum School, at Beverly, which is associated with the Trenton Normal School; the School for the Deaf at Trenton; and the Manual Training and Industrial School for Colored Youths at Bordentown. Higher institutions of learning which are located in New Jersey are: Princeton University at Princeton, Rutgers College at New Brunswick, Stevens Institute of Technology at Hoboken, St. Peter's College at Jersey City, College of St. Elizabeth at Convent Station, Mount St. Mary's College at Plainfield, Drew Theological Seminary at Madison, Seton Hall College at South Orange, Upsala College at Kenilworth, Bloomfield Theological Seminary at Bloomfield, and College of Jersey City. [Illustration: The metropolitan district including northeastern New Jersey and southeastern New York] POPULATION The population of New Jersey in 1910, according to the United States Census, was 2,537,168; and the density of population, or the number of people per square mile, was 337.7. In 1920, according to the United States Census, the population was 3,155,900, an increase of 24.4 per cent., giving a density of 420. Compared with other states. New Jersey was tenth in population, and third in density of population, Rhode Island being first and Massachusetts second. The area of greatest density of population is the northeastern section, including Bergen, Hudson, Passaic, Essex, Union, and Middlesex counties, which with an area of 1018 square miles had a population of 2,112,933, or more than sixty-five per cent, of the total population of the state. In this section there were more than 2000 persons per square mile. Hudson County, the smallest in the state, had the largest population, which was 629,124 or 14,630 per square mile. In Hoboken, with an area of less than two square miles, the population was more than 68,000 or more than 34,000 to the square mile. Other thickly populated sections are those of which Trenton and Camden are centers. Cape May County had the smallest and Ocean County the most scattered population, which was 22,155 or 35 per square mile.