What seems to have been the first attempt to define sizes of type suitable for school grades was made fifteen years ago by Mr Edward R. Shaw in his "School Hygiene"; he advocates sizes from eighteen-point in the first year to twelve-point for the fourth. "Principals, teachers, and school superintendents," he says, "should possess a millimetre measure and a magnifying glass, and should subject every book presented for their examination to a test to determine whether the size of the letters and the width of the leading are of such dimensions as will not prove injurious to the eyes of children." To this list, librarians might be well added--not to speak of authors, editors, and publishers. In a subsequent part of his chapter on "Eyesight and Hearing," from which the above sentence is quoted, appears a test of illumination suggested by "The Medical Record" of Strasburg, which may serve as a "horrid example" in some such way as did the drunken brother who accompanied the temperance lecturer. According to this authority, if a pupil is unable to read diamond type--four-and-one-half-point--"at twelve-inch distance and without strain," the illumination is dangerously low. The adult who tries the experiment will be inclined to conclude that whatever the illumination, the proper place for the man who uses diamond type for any purpose is the penitentiary.
The literature upon this general subject, such as it is, is concerned largely with its relations with school hygiene. We are bound to give our children a fair start in life, in conditions of vision as well as in other respects, even if we are careless about ourselves. The topic of "Conservation of Vision," in which, however, type-size played but a small part, was given special attention at the Fourth International Congress of School Hygiene, held in Buffalo in 1913. Investigations on the subject, so far as they affect the child in school, are well summed up in the last chapter of Huey's "Psychology and Pedagogy of Reading." In general, the consensus of opinion of investigators seems to be that the most legible type is that between eleven-point and fourteen-point. Opinion regarding space between lines, due to "leading," is not quite so harmonious. Some authorities think that it is better to increase the size of the letters; and Huey asserts that an attempt to improve unduly small type by making wide spaces between lines is a mistake.