634 Journal of Agricultural Research voi.xx.Mo. 8 



Chlorin and other ash constituents in potato ash are not included in 



Buckner's analyses. 



SUMMARY 



Analytical data for sprouts, skins, and tubers of three varieties of 

 Bordeaux-sprayed potatoes "stored at labratory temperature (average 

 70 F.) showed little variation in composition for the different varieties, 

 the age of the sprout apparently influencing the composition more than the 

 variety. " Data for Green Mountain sprouts, skins, and tubers from 

 Bordeaux-sprayed ~nd from unsprayed plants indicated that the spray 

 did not change the rate of growth or the composition of the sprouts. 



Biological changes are taking place in the formation and growth of the 

 sprouts. The percentage distribution of the nitrogenous substances 

 showed the sprouts to contain more protein and less diamino and other 

 basic nitrogen than the skins and tubers. The sprouts showed a selec- 

 tive action in withdrawing from the tubers nitrogen, ash, phosphoric acid, 

 and water in larger proportion than was originally present. 



The sprouts remained fresh and continued to grow as long as any water 

 was available in the tubers. The sprouts of the Irish Cobbler tubers 

 constituted 17 per cent of the total weight of the sprouts and tubers at 

 the time the tubers were exhausted, while the Green Mountain sprouts, 

 under the same conditions, constituted 5.5 per cent of the total weight. 

 An increased concentration or activity of the growth-promoting agent 

 or agents in Irish Cobbler tubers is suggested. 



LITERATURE CITED 



(1) Appleman, Charles O. 



1914. BIOCHEMICAL AND PHYSIOLOGICAL STUDY OF THE REST PERIOD IN THE 



tubers op solanum tuberosum. Md. Agr. Exp. Sta. Bul. 183, p. 

 181-226, 17 fig. 



(2) Association of Official Agricultural Chemists. 



1920. official and tentative methods of analysis. As compiled by the 

 committee on revision of methods. Revised to November 1, 1919. 

 417 p., 18 fig. Washington, D. C. Bibliographies at ends of chapters. 



(3) BucknER, David. 



1915. TRANSLOCATION OF MINERAL CONSTITUENTS OF SEEDS AND TUBERS OF 



certain plants during growth, hi Jour. Agr. Research, v. 5, no. 11, 



P- 449~45 8 - 



(4) Folin, Otto. 



1910. NOTE ON THE DETERMINATION OF AMMONIA IN URINE. In Jour. Biol. 



Chem, v. 8, no. 6, p. 497-498. 



(5) McCallum, W. B. 



1909. plant physiology and pathology. In Ariz. Agr. Exp. Sta. 20th Ann. 

 Rpt., [1908V09, p. 583-586. 



(6) MullER, Hermann, Thurgau. 



1885. BEITRAG ZUR ERKLARUNG DER RUHEPERIODEN DER PFLANZEN. In 



Landw. Jahrb., Bd. 14, p. 851-907, 1 fig. 



