REFERENCES TO SCIENTIFIC TECHNIQUE 61 



fUr die Jahre 1882 bis 1886, pp. 1-107, III-XVIII, 

 Berlin. 



This appears to be the original account of quantitative 

 studies as applied to plants and animals of an as- 

 sociation. These methods have been extended to 

 the sea bottom by Petersen, to fresh water by many 

 students, to land animals mainly by Dahl, and in 

 recent years to plants by Clements and others. 



HERRICK, C. L. 



1905. Home Life of Wild Birds. Revised Edition, pp. 255. 



New York. 



Very valuable for suggestions on the study of live 

 birds and how to photograph them. 



^HOPKINS, A. D. 



1893. Note and Record Keeping for the Economic Ento- 

 mologist. U. S. Dept. Agr., Div. Ent., Insect Life, 

 Vol. VI, pp. 103-108. 



JOB, H. K 



1910. How to Study Birds. A Practical Guide for Amateur 

 Bird-Lovers and Camera-Hunters, pp. 272. New 

 York. Outing Publishing Co. 



Intended primarily for beginners in bird study, but 

 contains valuable practical advice on methods of 

 studying and photographing live birds which will 

 aid the ecologist. Consult also Kearton (1907), 

 Chapman (1900), and Herrick (1905). 



KEARTON, R. 



1907. Wild Life at Home : How to Study and Photograph It. 

 New and Revised Edition, pp. 204. London. 



KEPHART, H. 

 1912. The Book of Camping and Woodcraft, pp. 331. Fifth 



Edition. Outing Publishing Co. 



This is the best all-round book on the technique of 

 camping and living in the wilderness which I have 

 seen. It includes direction for selecting outfits, 



