HISTORICAL INTRODUCTION 13 



was not until 1915 that Maze claimed the essential quality of 

 boron for plant growth. For a few the claim is very tenta- 

 tive and in others the justification for the claim rather tenuous, 

 but for most the evidence is definite enough to be accepted. 



Manganese 



Rumex Acetosa (sorrel) Boullanger, 1912 

 Fagopyrum esculentum (buckwheat) Meyer, 1931 

 Beta marilima (mangold) Gilbert and McLean, 1928 



B. maritima (beet) Gregoire, Hendrick and Carpiaux, 1907 

 Spinacia oleracea (spinach) Tacheuchi, 1909 

 Bougainvillea sp. Dickey and Reuther, 1938 



Cochlearia Armoracia (horse -radish) Picado and Vicente, 1923 



Sinapis alba (white mustard) Clausen, 1913 



Brassica campestris (turnip) Chittenden, 1915 



Raphanus sativus (radish) McHargue, 1923 



Fragaria vesca (strawberry) Hoagland and Synder, 1933 



Prunus Persica (peach) Weinberger and Cullinan, 1937 



Lupinus spp. (lupins) Montemartini, 1911; blue lupin, Scholz, 1934 



Medicago saliva (lucerne) D'Ippolito, 1914 



M. denticulata (toothed bur clover) Samuel and Piper, 1929 



Trifolium subterraneum (subterranean clover) Samuel and Piper, 1929 



Vicia Faba (broad bean) Bonomi, 1908; Tacheuchi, 1909; Monte- 

 martini, 1911 



Pisum arvense (field pea) McHargue, 1923 



P. sativum (garden pea) Kakahi and Baba, 1907 



Lathyrus tuberosus (earth-nut pea) Zlartarov, 1934 



Cicer arietinum (chick pea) Zlartarov, 1934 



Phaseolus communis (kidney bean) Andouard and Andouard 1911; 

 Stoklasa, 1911 



Glycine hispida (soya bean) McHargue, 1923 



Vigna sinensis (cow pea) McHargue, 1923 



Linum usitatissimum (flax) Takeuchi, 1909 



Citrus sinensis (orange) Haas, 1932 



C. limonia (lemon) Haas, 1932 



C. limonia (rough lemon) Haas, 1932 



Aleurites fordii (tung-oil tree) Reuther and Dickey, 1937 



A. montana (mu-oil tree) Reuther and Dickey, 1937 



Vitis vinij 'era (vine) Montemartini, 1911 



Lagerstroemia indica (crape myrtle) Dickey and Reuther, 1938 



Psidium cattleianum (cattley guava) Dickey and Reuther, 1938 



Apium graveolens (celery) Boullanger, 1912 



Daucus Carota (carrot) Boullanger, 1912 



Vaccinium corymbosum (blueberry) Shive. 1933 



Allamanda cathartica Dickey and Reuther, 1938 



Solarium tuberosum (potato) Gregoire, Hendrick and Carpiaux, 1907 



Lycopersicum esculentum (tomato) Schreiner and Dawson, 1927 



