EQUIPMENT 21 



containing a number of tables with drawers for the use of 

 the pupils, and several shelves or cases for holding pre- 

 served material. If such a workroom is not available 

 two or three tables placed in the schoolroom will be found 

 of great use. For those who wish to do much in the line 

 of dissection a few thirty-five cent scalpels, or dissecting 

 knives, forceps, needles, scissors, and trays both of tin 

 and wood are necessary. The bottoms of the tin trays 

 should be covered with a quarter-inch layer of melted 

 paraffine to which the small animals are to be pinned while 

 being dissected under water. 



At least one or two compound microscopes are neces- 

 sary. A satisfactory instrument can be purchased for 

 about $30. A few dissecting microscopes costing about 

 $2.50 each are of service in the study of many forms. 



A half gross of glass object slides and a half ounce of num- 

 ber two cover glasses are required for the examination of 

 microscopic objects. A bottle of chloroform and a quarter 

 of an ounce of chloretone dissolved in a quart of water 

 should be ready for use as described in the special lessons. 



Books. The pupils in addition to their text-books 

 will take an interest in consulting the following references 

 if they are accessible: 



APGAR, A. C. : Birds of the United States. American Book Com- 

 pany. $2.00. Will help one to identify the birds in the hand 

 or in the field. 



*BERGEN, J. Y. and F. D: A primer of Darwinism and Organic 

 Evolution. Lee & Shepard. Boston. $1.25. Explains how 

 species have originated. 



*BLANCHAN, NELTJE: Bird Neighbors. Doubleday, Page & Com- 

 pany. New York. $2.00. Contains colored plates and enables 

 one to identify one hundred and fifty birds in the field. 



