162 INDEX TO AMERICAN BOTANICAL LITERATURE 
Bacillus solanisaprus. Phytopathology 13: 359-361. 8S 
1923. 
Parlin, J.C. Selaginella apoda in Maine. Rhodora 25: 188. 
26 O 1923. 
Pickett, F. L. An ecological study of Cheilanthes gracillima. 
Bull. Torrey Club 50: 329-338. f. 1-25. 19 N 1923 
Poole, J. P. Comparative anatomy of leaf of Cycads, with 
reference to Cycadofilicales. Bot. Gaz. 76: 203-214. pl. 
17-19. 15 O 1923. 
Power, F. B. & Chestnut, V. K. Chemical examination of 
the tubers of Cyperus esculentus Linné. Jour. 
Agr. Research 26: 69-76. 13 O 1923. 
Pretz,H.W. Additional notes on Sonchus uliginosus. Torreya 
23: 79-85... O 1923. 
Rathbun, A. E. Damping-off of taproots of conifers. Phyto- 
pathology 13: 385-391. 18S 1923. 
Record, S. J. Forests of the Amazon. Am. For. 29: 591. O 
1923. 
Reed, E. L. Extra-floral nectar glands of Ricinus communis. 
Bot. Gaz. 76: 102-106. f. 1-12. 15S 1923. 
Reed, H. S. & Haas, A.R.C. Studies on the effects of sodium, 
potassium, and calcium on young orange trees. Univ. Cali- 
fornia Publ. Agr. Exp: Sta. Techn. Pap. 11: 1-24. pl. r. O 
1923. 
Richards, B. L. Soil temperature as a factor affecting the patho- 
genicity of Corticium vagum on the pea and the bean. Jour. 
Agr. Research 25: 431-450. pl. 152. 15S 1923. 
Robbins, W. J. An isoelectric point for plant tissue and its sig- 
nificance. Am. Jour. Bot. 10: 412-439. f. I-6. 2301923. 
Robinson, B. L. Emily Frances Fletcher. Rhodora 25: 149, 
150: 39S 1623. 
Sax, K. & Gowen, J. W. The place of stocks in the propagation 
of clonal varieties of apples. Genetics 8: 458-465. f. I. 
> 302%, 
