[Vol. 2, 1915] 



572 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



\ r olkens, G. ('84). Die Kalkdriisen der Plumbagineen. Ber. d. deut. bot. Ges. 

 2:334-342. pi. 8. 1884. 



Wachter, W. ( '05 ) . Untersuchungen (iber den Austritt von Zucker aus den Zellen 

 der Spcicherorgane von Allium Cepa und Beta vulgaris. Jahrb. f. wiss. Bot. 

 41 : 165-220. 1 f. 1905. 



Wheldale, M. ('14). Our present knowledge of the chemistry of the Mendelian 

 factors for flower-colour. Jour. Genet. 4: 109-129. pi. 7. 1914. [See p. 125.] 



Whitney, M., and Cameron, F. K. ('03). The chemistry of the soil as related 

 to crop production. U. S. Dept. Agr., Bur. Soils, Bui. 22: 1-71. 1903. 



Wilson, W. P. ('81). The cause of the excretion of water on the surface of 

 nectaries. Bot. Inst. z. Tubingen, Untersuch. 1:1-22. 1881-1885. 



