INDEX TO AMERICAN BOTANICAL LITERATURE a7 
Neidig, R. E.,& Snyder, R.S. Sunflower investigations. Jour. 
Agr. Research 24: 769-780. 2 Je 1923. 
Neidig, R. E., & Snyder, R. S. Sweet clover investigations. 
Jour. aes Research 24: 795-800. 2 Je 1923. 
Noe, A.C. A Paleozoic Angiosperm. Jour. Geol. 31: 344-347. 
7 or 8. Je 168%; 
Olson, G. A. A study of factors affecting the nitrogen content 
of wheat and of the changes that occur during the develop- 
ment of wheat. Jour. Agr. Research 24: 939-954. f. I, 2. 
16 Je 1923. 
Overbeck, F. Zur Kenntnis des Mechanismus der Samenaus- 
schleuderung bei Oxalis. Jahrb. wissensch. Bot. 62: 258- 
ge2.}. I-12. My 1923. 
Pearson, W. H. More New Zealand Hepaticae. Univ. Cali- 
fornia Publ. Bot. 10: 373-392. pl. 104-109. 9 Je 1923 
Pearson, W.H. Notesonacollection of New Zealand Hepaticae. 
Univ. California Publ. Bot. 10: 307-370. pl. 83-103. 9 Je 
1923. 
Peltier, G. L., & Frederich, W. J. Relative susceptibility of 
Citrus fruits and hybrids to Cladosporium Citri Massee. 
Jour. Agr. Research 24: 955-960. 16 Je 1923. 
Pilger, R. Plantae Liitzelbergianae brasilienses I. Notizbl. 
Bot. Gart. u. Mus. Berlin—Dahlem 8: 425-451. 15 Je 1923. 
Pilger, R. Gramineae nonnullae austro-americanae. Notizbl. 
Bot. Gart. u. Mus. Berlin-Dahlem 8: 452-456. 15 Je 1923. 
Includes new species in Schizachyrium (1), Melica (3), and Chusquea (1). 
Plunkett, O. A., Young, P. A., & Ryan, R. W. A systematic 
presentation of new genera of Fungi. Trans. Am. Micr. 
Soc. 42: 43-67. My 1923. 
Lists genera proposed since 1910. 
Pringsheim, E.G. Uber die Transpiration bei Fucus. Jahrb. 
wissensch. Bot. 62: 244-257. f. 1-4. My 1923. 
