134 MAINE AGRICULTURAL EXPERIMENT STATION. 



FRANK, E. — To what extent can free atmospheric nitrogen 

 be utilized for the nourishment of plants? (Inwieweit ist der 

 freie Luft-Stickstoff fur den Ernahrung der Pflanzenver- 

 werthbar?) Deut. landw. Presse 18: 779, 1891. Abstract. Ex. 

 Sta. Record III,. 418. 



FRANK. B. — The dimorphism of root tubercles on the pea. 

 Berichte d. deut Bot. Ges. 10: 170, 1892. Abstract, Chem. Cen- 

 tralb. 1892, II, No. 15, p. 654. 



FRANK, B. — On the gas exchanges of the root tubercles of 

 leguminous plants. (Ueber die auf den Gasaustausch beziig- 

 lichen Einrichtungen und Thatigkeiten der Wurzelknollchen 

 der Leguminosen). Berichte d. deut. Bot. Ges. 10: 271. 1892. 

 Abstract, Ex. Sta. Record IV, 506. 



FRANK. B. — The assimilation of free atmospheric nitrogen 

 by plants in its relation to species, supply of plant food and kind 

 of soil. (Die Assimilation freien Stickstoffs bei den Pflanzen 

 in ihrer Abhangigkeit von Species, Ernharungs Verhaltnissen 

 und von Bodenarten). Landw. Jahrb. 21: 44. 1892. Abstract, 

 Ex. Sta. Record III. J32. 



FRANK. B. — The nitrogen question. (Noch ein Wort zur 

 Stickstoff-frage). Deut landw. Presse 1893. 183. 184; Abstract, 

 Bot. Centbl. 55: 216, 1893. 



FRANK. B. — The assimilation of free nitrogen in the plant 

 world. (Die Assimilation des freien Stickstoffs durch die Pflan- 

 zenwelt). Bot, Zeit. 51: 138. 1893. Abstract, Ex. Sta. Record 

 VI. 15. 



FRANK. B. — The assimilation of free nitrogen by non- 

 leguminous plants. (Neue Stimmen iiber die Stickstoff frage). 

 Deut. land. Presse 21, 119, 1894. 



FRUAYIRTH. — Soil inoculation for leguminous plants. 

 Deut. landw. Presse 18: 127, 1891: also 19: 6, 14. 171. 1892. 

 Abstract, Ex. Sta. Record V, 619. 



GAIN, E. — The influence of humidity on the development 

 of tubercles on the roots of Leguminosae. (Influence de 1' 

 humidite sur le development des nodosites des Leguminosae). 

 Compt. rend. 116: 1394. 1893. Abstract, Ex. Sta. Record. V, 

 112. 



GIELE. J. — The fixation of free nitrogen by plants. Rev. 

 Agron. 4: 321. 1895. 



