264 BOTANICAL GAZETTE [april 



5. Accumulation of sugar in the flower and its vicinity varies 

 inversely as the temperature. 



6. The optimum condition for sugar secretion is an alternation 

 of low and high temperatures. 



7. Variation of atmospheric pressure has no marked influence 



on secretion. 



8. Sugar excretion is markedly diminished in darkness on 

 account of limitation of the food reserves of the plant. Water 

 excretion may or may not continue, depending upon the species. 

 Removal of the leaves has the same deterrent effect. 



9. The more favorable all conditions for growth and the more 



greater is the amount 



blooming 



. Nectar is most abundant early in the 

 things being equal. 



. Accumulation and secretion of sugar is most 

 he time of the opening of the flower. 



Grateful recognition is due Drs. Pammel, Dox, and Coover, of 

 Iowa State College, Drs. Cowles and Crocker of the University 

 of Chicago, Dr. Phillips of the Bureau of Entomology, and 

 Mr. Pellett, Bee Inspector for Iowa, for encouragement and 

 assistance in this work. 



Ewixg Christian College 



Allahabad, India 



LITERATURE CITED 



1. Bonnier, G., Les Nectaries. Ann. Sci. Nat. Bot. 8:1-212. 1879. 



2. — -, Influence du terrain sur la production du nectar des plantes. 



Ass. Fr. Av. Sci. 2:567, 569. 1893. 



3. Bonnier, G., and Flahault, Ch., Observations sur les modifications des 

 vegetaux suivant les ponditions physiques du milieu. Ann. Sci. Nat. Bot. 

 7:108-113. 1878. 



4. Browne, C. A., Chemical analysis and composition of American honeys. 

 U.S. Dept. Agric. Bur. Chem. Bull. no. no. 



5. Busgen, M., Der Honigthau. Jenaische Zeitsch. Nat. 25:339-428. 1891. 



6. Darwin, C, Cross and self-fertilization in the vegetable kingdom. 1877 



(chapter x). 

 7. Eckerson. 



Bot. Gaz. 58:254-263. 1914 



8. Fischer, A., Beitrage zur Physiologie der Holzgewachse. Jahrb 

 Bot. 22:73-160. 1886. 



r* 





