ss in Children of School Age._
The University Press, Manchester, England. (1911.) 359 pages.

61. Sherlock, E. B. _The Feeble-Minded; A Guide to Study and
Practice._ The Macmillan Company. (1911.) 327 pages.

62. Tredgold, A. F. _Mental Deficiency (Amentia)._ Bailliere,
Tindall, and Cox. London, England. (2d ed. 1914.) 491 pages.

The best medical treatment of the subject.

STUDIES OF THE PROGRESS OF CHILDREN THROUGH THE GRADES

63. Ayres, Leonard P. _Laggards in our Schools._ The Russell Sage
Foundation. (1909.) 236 pages.

Interesting and instructive discussion of school retardation and
its causes.

64. Blan, Louis B. _A Special Study of the Incidence of
Retardation._ Teachers College, Columbia University,
Contributions to Education, no. 40. (1911.) 111 pages.

Review of the literature and a statistical study of the progress
of 4579 children.

65. Keyes, C. H. _Progress Through the Grades of City Schools._
Teachers College, Columbia University, Contributions to
Education, no. 42. (1911.) 79 pages.

Important study of the progress of several thousand children.

66. Strayer, George D. _Age and Grade Census of Schools and
Colleges._ Bulletin no. 451, U.S. Bureau of Education. (1911.)
144 pages.

Statistics of the age-grade status of the children in 318 cities.

67. See also the _Reports_ of leading school surveys, such as
those of New York, Salt Lake City, Butte, Springfield (Mass.),
Denver, Cleveland, etc.

REFERENCES ON THE SPECIAL CLASS FOR EXCEPTIONAL CHILDREN

68. Huey, E. B. "The Education of Defectives and the Training of
Teachers for Special Classes"; in _Journal of Educational
Psychology_ (1913), pp. 545-50.

69. Goddard, H. H. _School Training of Defective Children._ World
Book Company. (1914.) 97 pages.

Based on his survey of the treatment of backward children in the
schools of New York City.

70. Holmes, W. H. _School Organization and the Individual Child._
The Davis Press, Worcester, Massachusetts. (1912.) 211 pages.

A comprehensive account of the efforts which have been made to
adjust the school to the capacities of individual children.

71. Maennel, B. _Auxiliary Education._ Translated from the German
by Emma Sylvester. Doubleday, Page & Co. (1909.) 267 pages.

72. Van Sickle, J. H., Wi