refr *f /3y 



^ \\\ "h o i - u , mostly separated from the gu tM oyifr plant. 



ever, determinations of the respiration of normal, living 

 roots have been made by several investigators" and the 

 well known fact of the frequent excretion of carbon 



1. Heintz,- Bot. Jahresber. 1875: 358; 

 ler-Ihurgau,- Landw. Jahrb. 14: 851 (1885 J; Kny,- 



Ber. dent. bot. ies. : 164 (1889); Bevaux,- Bull, 



Soc. bot. 57: 257 (1890 J; Bohm,- Verb. Zool.-Bot. 3es. 

 ., ■ _ _._; 47 (1892); Biegenbein,- Jahrb. wiss. Bot. _ 

 563 (1895); Richards,- Ann. Bot. 10: 531 (1896), 11: 

 29 (1897); Wilms,- Jour. Landw. 47; 261 (1899); Tochting,- 

 Bot. Ztg, 1: 91 (1902); Stocklasa,- Beitr. ! s Lol. 

 u. Path. 3: 473 (1903); 3trohmer f - -est. Zeits, Zucker- 

 ind. 51: 933 (1905), 32: 1 (1903); Ehrenberg,- Zeits. 

 fur Pflanzenkrankh. 16: 193 (1905); Buggar and Hill,- 

 S Lence j 3: 261 (1911); Appleman.,- dryland Agr, Exp. 

 Sta., Bull. 183 (1914), Bull. 191 (1915); Hasselbring 

 and Lns,- Jour. Agr. Bes._5: CO 9-517 (1915 . 



2. de Baussure,- Becherches chiiniques, pp. 8, 

 60-61 (1904); Ilobbe,- Landw. Vers. Stat, ]_; 451 (1865); 

 Beherain and Yesque,- Ann. Sci. nat. (6) 5_: 3i (1876 ; 

 Salkewica,- Bot. Jahresber. 1877 : 722, Ann. Agron. 7_: 

 (1882); Cauvet,- Bull. ooe. Bot. ~Y: 113 (1880); Palla- 

 din,- Ber. deut. bot. ues. 4: 322 (1886); A3 a,- 



I rsch. 3-eb. Agr, Phys, _ 6: 450 (1895). 



