METHOD OF USE OF THIS BOOK 17 



contents of the unit. When you have tested yourself, check back 

 on the survey questions to see if you have any corrections to 

 make there. After this is done you are ready to make your report 

 to the class on the unit or such part of it as your teacher may 

 assign to you. To prepare for this recitation make an outline 

 summary for your workbook. This will help you to organize 

 the material in the unit in the best possible way, and thus come 

 to a complete understanding of the material contained therein. 

 If you understand this plan of the book, you will be able to get 

 better results in its use. 



The last unit in the book gives short and interesting stories about 

 a few scientists who, by much work and perseverance, made 

 remarkable discoveries that have so largely contributed to our 

 knowledge of biology. The lives of these men may be studied in 

 relation to the unit in which their work is discussed or they may be 

 studied at the completion of the other units. 



Useful References 



Apgar, E. A., Trees of the Northern United States. (American Book 



Company, New York) 

 Bailey, F. A., Handbook of Birds of the Western United States. (Houghton, 



Mifflin Co., Boston. 1921) 

 Boulenger, E. G., Aquarium Book. (D. Appleton & Co., New York. 1926) 

 Clements, E. G., Flowers of Mountain and Plain. (H. W. Wilson Co., 



New York. 1920) 

 Comstock, J. H., and Comstock, A., How to Know the Butterflies. (Corn- 

 stock Publishing Co., Ithaca, N. Y. 1920) 

 Downing, E. R., Our Living World. (Longmans, Green & Co., New York. 



1924) 

 Georgia, A. E., Manual of Weeds. (The Macmillan Co., New York. 



1914) 

 Hodge, C. F., Nature Study and Life. (Ginn & Co., Boston) 

 Hornaday, W. T., American Natural History. (Charles Scribner's Sons, 



New York) 

 Lutz, F. E., Field Book of Insects. (G. P. Putnam's Sons, New York. 



1921) 

 Needham, J. G., and Lloyd, J. T., Life of Inland Waters. (Comstock 



Publishing Co. 1923) 

 Palmer, E. L., Field Book of Nature Study. (Comstock Publishing Co. 



1927) 

 Thomson, J. A., Outline of Science. (G. P. Putnam's Sons. 1922) 

 Waters, H. J,, Essentials of the New Agriculture. (Ginn & Co. 1924) 



