516 References 



Nicholls, A. G., 1933, On the biology of Calanus finmarchicus. III. Vertical distri- 

 bution and diurnal migration in the Clyde Sea area, /. Marine Biol. Assoc. 

 United Kingdom, 19: 139-164. 



Nielsen, A., 1950, The torrential invertebrate fauna, Oikos, 2: 176-196. 



Nielsen, C. O., 1949, Studies on the soil microfauna. II. The soil inhabiting nema- 

 todes, Natttra Juilandica, 2: 1-127. 



Niering, W, A., 1953, The past and present vegetation of High Point State Park, 

 New Jersey, Ecol. Monographs, 23: 127-148. 



Odum, E. P., 1953, Fundamentals of Ecology, Saunders, Philadelphia. 



Costing, H. J., 1948, The Study of Plant Communities, W. H. Freeman & Co.. 

 San Francisco. 



Costing, H. J., and W. D. Billings, 1942, Factors affecting vegetational zonation 

 on coastal dunes. Ecology, 23: 131. 



Osborn, F., 1948, Our Plundered Planet, Little, Brown & Co., Boston. 



Park, O., 1931, The measurement of daylight in the Chicago area and its eco- 

 logical significance, Ecol. Monographs, 1: 189-230. 



Park, O., 1940, Nocturnalism— the development of a problem, Ecol. Monographs, 

 10: 485-536. 



Park, O., 1941, Quantitative determination of rhythmicity in organisms, Ohio J. 

 Sci., 41: 39-45. 



Park, O., W. C. Alice, and V. E. Shelford, 1939, A Laboratory Introduction to 

 Animal Ecology and Taxonomy, University of Chicago Press. 



Park, T., 1941, The laboratory population as a test of a comprehensive ecological 

 system, Quart. Rev. Biol, 16: 274-293, 440-461. 



Parkins, A. E., and J. R. Whitaker, 1939, Our Natural Resources and Their Con- 

 servation, Wiley, New York. 



Parr, A. E., 1939, Quantitative observations on the pelagic sargassum vegetation 

 of western North Atlantic, Bull. Bingham Oceanographic Collection, 6, Art. 7. 



Patrick, Ruth, 1948, Factors affecting the distribution of diatoms, Botan. Rev., 

 14: 473-524. 



Pearl, R., and S. L. Parker, 1922, Experimental studies on the duration of life. 

 IV, Data on the influence of density of population on the duration of life in 

 Drosophila, Am. Naturalist, 56: 312-321. 



Pearl, R., L. J. Reed, and J. F. Kish, 1940, The logistic curve and the census count 

 of 1940, Science, 92: 486-488. 



Pearse, A. S., 1939, Animal Ecology, McGraw-Hill, New York. 



Pearse, A. S., 1942, Introduction to Parasitology, Thomas, Springfield. 



Pearse, A. S., 1950, The Emigrations of Animals from the Sea, Sherwood Press, 

 Dryden, N. Y. 



Pennak, R. W., 1939, The microscopic fauna of the sandy beaches, Publ. Am. 

 Assoc. Advanc. Sci., 10: 94. 



Pennak, R. W., 1942, Ecology of some copepods inhabitating intertidal beaches 

 near Woods Hole, Mass., Ecology, 23: 446-456. 



Petrides, G. A., 1950, The determination of sex and age ratios in fur animals. 

 Am. Midland Naturalist, 43: 355-382. 



Petrunkevitch, A., 1952, The spider and the wasp, Sci. American, 187 (2): 20-23. 



Phillips, W. S., 1940, A tropical hammock on the Miami (Fla. ) limestone, Ecology, 

 21: 166-175. 



Pitelka, F. A., 1941, Distribution of birds in relation to major biotic communities. 

 Am. Midland Naturalist, 25: 113-137. 



