1. Exploratory pot experiments on sensitiveness of different crops to sodium: B. Oats

   • J. J. Lehr

   OriginalPaper Pages: 289 - 297

2. Comparative effects of sodium nitrate and calcium nitrate on the potato

   • Onorato Verona
   • Antonio Benvenuti

   OriginalPaper Pages: 298 - 302

3. “Zinnia Mosaic”, A new virus

   • M. Rubio Huertos

   OriginalPaper Pages: 303 - 307

4. The Donnan-principle in the ionic relations of plant roots

   • G. J. Vervelde

   OriginalPaper Pages: 309 - 322

5. Grundlegende Bemerkungen zum „Umkehrbaren ertrags-Stickstoff-Gesetz” von O. W. Willcox. (The inverse yieldnitrogen law)

   • Eilh Alfred Mitscherlich
   • Paul Schäfer

   OriginalPaper Pages: 323 - 335

6. Biosynthesis of amino acids according to soil fertility

   • Fred E. Koehler
   • William A. Albrecht

   OriginalPaper Pages: 336 - 344

7. A laboratory study of the decomposition of vegetable debris in relation to the formation of raw humus

   • D. R. Johnston

   OriginalPaper Pages: 345 - 369

8. The volatile fatty acids present in fresh and in fermented marrow-stem kale

   • A. J. G. Barnett
   • R. E. B. Duncan

   OriginalPaper Pages: 370 - 376

9. Quick analysis of small samples of new potato varieties

   • A. H. A. De Willigen
   • P. W. De Groot

   OriginalPaper Pages: 377 - 383