JQ08.] IMPROVEMENT OF THE POTATO. 455 



91 a. SEMPOivOWSKi, A., Increasing the harvest by selecting seed 

 potatoes. Deut. Landw. Presse. 22:21. 1895. 



92. STUART, WM., Disease-resistant potatoes. Vt. Agr. Exp. 

 Sta. Bull. 115:135-140. 1905. 



93. STUART, WM., Disease resistance of potatoes. Vt. Agr, 

 Exp. Sta. Bull. 122:107-136. 1906. 



94. SUTTON, A. W., Potatoes ancient and modern. Jour. Hort. 

 1895:405-416. 



95. SUTTON, A. W., The potato. Jour. Roy. Agr. Soc. Eng- 

 land. Ser. 3. 9:581-653. 1898. 



96. TmELE, P., Uber der Kartoffel als saatgut. Illus. Landw. 

 Ztg. 1897:616. 



97. THORNE, C. E., Essentials of successful field experimenta- 

 tion. U. S. Dept. Agri. Office Exp. Sta. Farmers' Institute 

 lecture. No. 6. 1-24. 1905. 



98. TUCKERMANN, R., The degeneration of potato varieties. 

 Mitt. Landw. Inst. Breslau. 3 :No. i, 1-92. 1904. 



99. VERNON, H. M., Variations in animals and plants. 1-415. 

 Lond. 1903. 



100. VOCHTING, H., tiber Transplantationen an Pflanzenkorper. 

 Tubingen. 1892. 



101. VOCHTING, H., Zur Physiologic der Knollengewachse. 

 Jahrb. Wiss. Bot. (Pringsheim) 34:1-148. 1899. 



1 02. WARREN, E., An observation on inheritance in parthenogen- 

 esis. Proc. Roy. Soc. 65:154-158. 1899. 



103. WARREN, E., Variation and inheritance in the parthenogen- 

 etic generations of the Aphis "Hyalopterus triphodus." 

 (Walker) Biom. i :i29-254. 1902. 



104. WATERSTRADT, P., und WIU.NER, M., Die chemische Zus- 

 ammensetzung und der anatomische Aufbau in ihrer Bezie- 

 hung zum Kartoffelknolle. Bl. Gersten, Hopfen u. Kartoffel- 

 bau. 3: 2 93-35- 1 9 OI > 



105. WEISMANN, AUGUST, trans. THOMSON, J. A., The evolu- 

 tion theory. 2v. Lond. 1904. 



106. WESTERMEIER, N., Versuche uber die angemessene Pflanz- 

 weite bei Kartpffeln. Puhling's Landw. Ztg. 49:1897. Also 

 Zts. f. Spirit. Ind. Ann. Rpt. 1898. 



107. WOHI/TMANN, P., Uber Kartoffel Ziichtung. Illus. landw. 

 Ztg. 1 897 :Nr. 34-36. 



108. WOU.NY, E., (See No. 43. v. 3) Zts. f. Spirit. Ind. 1883 : 

 203. 



