USEFUL INFORMATION FOR TEACHERS 75


Biological Supply
Illinois.
 Leaflet No. 1.
 Leaflet No. 2.
 Leaflet No. 5.
 Leaflet No. 8.
 Leaflet No. 10.
 Leaflet No. 13.
 Leaflet No. 23.
 Leaflet No. 35.
 Leaflet No. 45.
 Leaflet No. 46.
 Leaflet No. 47.
 Leaflet No. 48.
 Leaflet No. 49.
 Leaflet No. 53.


House, 761-763 East 69th Place, Chicago, 37

How to Make an Insect Collection.
Preserving Zoological Specimens
Starting and Maintaining a Balanced Fresh-Water
Aquarium.
How to Prepare Microscope Slides of Simple Objects.
The School Terrarium.
Rearing the Silk-Worm Moth.
Feeding Aquarium and Terrarium Animals.
Studying Ants in Observation Nests.
Lantern Slides Any Teacher Can Make.
The Study of Fossil Plants.
The Study of Fossil Animals.
Aquarium Troubles: Their Prevention and Remedies.
Nutrition Experiments.
The Care and Breeding of the Golden Hamster.


Library Material for Children
 The School Library. Reading has been emphasized as one
of the ways in which children learn science. Every class should
have access to a variety of attractive books written and illu-
strated in a style that challenges the children to further reading.
The books selected for the library should cover a wide range of
subject matter in order to help meet different interests of chil-
dren. At the same time, the. books should represent a wide
range of reading levels in order to meet the varying degrees of
reading skill possessed by pupils.
 Teachers and others responsible for selecting library books
will find that the 1947 List of State Adopted Library Books is
an excellent source of information and guide for buying, what-
ever the source of funds may be. The list now contains several
thousand titles. The subject index makes it easy to locate the
science books. Each book is annotated and it is therefore pos-
sible to determine which books will be appropriate. The read-
ing level is indicated by an "E" for easy, "A" for average and
"M" for mature. Some of the books included under Science in
the subject index are primarily narrative in nature, but these
books were not included in the list unless the science informa-
tion contained in them was also authentic.
 Extension Library Service. The General Extension Divi-
sion has materials available that are of assistance to many
classes. In the main these materials are of four types:
 1. Unit libraries for children. The unit library is a col-
 lection of children's books on one subject. Each library
 contains approximately 20 books on varying levels of
 difficulty. Fiction is often included, but a library is
 planned to offer factual information told entertainingly