While Comenius was not willing to go as far as St. Augustine and the early church fathers in the matter of abolishing altogether the whole body of pagan literature from the school, nevertheless, he thought that the best interests of the religious education of the child required unusual precaution in the reading of pagan books. He reminds his readers that it is the business of Christian schools to form citizens, not merely for this world, but also for heaven, and that accordingly children should read mainly those authors who are well acquainted with heavenly as well as with earthly things. _Types of Educational Institutions_ The modern fourfold division of education into kindergarten, elementary schools, secondary schools, colleges or universities was clearly foreshadowed by Comenius in the _Great didactic_. His philosophy of education comprehends a school of infancy, a school of the mother-tongue, a Latin school, and a university. These different institutions, he notes, are not merely to deal with different subjects, but they are to treat the same subjects in different ways, giving such instruction in all of them as will make true men, true Christians, and true scholars, although grading the instruction throughout to the age, capabilities, and previous training of the learners. 1. _School of infancy._ Comenius would have a mother’s school in every home, where children may be given such training as will fit them at the age of six years to begin regular studies in the vernacular school. He prepared for the use of mothers during this period a detailed outline, which he published under the title, _Information for mothers, or School of infancy_. An analysis of this book is given in the following chapter on the earliest training of the child. 2. _School of the mother-tongue._ This covers the years from six to twelve, and includes all children of both sexes. The aim of this school is to teach the young such things as will be of practical utility in later life—to read with ease both printing and writing in the mother-tongue; to write first with accuracy, and finally with confidence in accordance with the rules of the mother-tongue; to compute numbers as far as may be necessary for practical purposes; to measure spaces, such as lengths, breadths and distances; to sing well-known melodies, and to learn by heart the greater number of psalms and hymns commonly used in the country. In addition, the children study the principles of morality, the general history of the world, the geography of the earth and principal kingdoms of Europe, elementary economics and politics, and the rudiments of the mechanical arts.