Mac Dougal: fixation of free nitrogen. 187 



The list is composed of titles which have been incidentally- 

 collected by Professor MacMillan and the writer, and are com- 

 prised in the card catalogue of the botanical department of the 

 University of Minnesota. Their presentation in this form is 

 for the purpose of making them still more readily available to 

 students and investigators in connection with this department, 

 and wherever this line of work is carried forward. It is pur- 

 posed to bring out a second installment of titles which the 

 writer in the limited time at his disposal was not able to prepare 

 for this number. 



Allen E. W. Leguminous plants for green manuring and for 

 feeding. U. S. Dept. Ag. Farm. Bull. No. 16. 1894. 



Alpe and DIenozzi. Bull. d. notize agrarie d. Ministere d' 

 Agric. No. 14. 1892. 



Andre. See Berthelot. 



Arcangeli. Sopra i tubercoli radicali delle Leguminose. Atti 

 del. real. Accad: d. Lincei, 7 : Pasc. 6, 223. 1891. 



Atkinson G. F. Science Cont. Ala. Ex. Sta. 1 : 1. 1889. 



Atkinson G. F. The genus Prankia in the United States. Bull. 

 Torr. Bot. Club 19: 171 1892. 



Atkinson G. F. Tubercles of Ceanothus. Bot. Gazette 

 16:262. 1891. 



Atkinson G. F. Contributions to the biology of the organism 

 causing leguminous tubercles. Bot. Gazette 18:157, 

 226, 257. 1893. 



Atkinson G. F. Symbiosis in the roots of the Ophioglossaceae. 

 Bull. Torr. Bot. Club 20:356. 1893. 



Atwater and Rock wood. On the loss of nitrogen during germ- 

 ination and growth. Am. Chem. Jour. 8 : 327, 1868. 



Atwater W. 0. On the assimilation of atmospheric nitrogen 

 by plants. Rep. Brit. A. A. S. 685. 1884. 



Atwater W. 0. Absorption of atmospheric nitrogen by plants. 

 Am. Chem. Jour. 6:365. 1885; also, 12:526. 1891; 

 also, 13:42. 1891. 



Atwater and Woods. Atmospheric nitrogen as plant food. 

 Conn. Storrs Ag. Ex. Sta. Rep. 2:11. 1889; also, 

 3:12. 1890. 



Atwater and Woods. The fixation of free nitrogen by plants. 

 Conn. Storrs Ag. Ex. Sta. Rep. 5:17. 1892. 



Atwater W. 0. On the liberation of nitrogen from its com- 

 pounds, and the acquisition of atmospheric nitrogen 

 by plants. Am. Chem. Jour. 8:398. 1868. 



