190 Botanisches Centralblatt. 



Warburg, O. 1907. Ueber die tropische Landwirtschaft. (Jahrber. 

 Ver. angew. Bot. IV. p. 20-39.) 



Warcollier, G. 1907. La sucrase dans les moüts de pommes et les 

 cidres. (C. R. Ac. Sc. Paris. CXLIV. 18. p. 987—990.) 



Watt, G. 1907. Tea and the tea plant. (Journ. roy. hortic. Soc. 

 XXXII. p. 64-96.) 



Weinzierl, Th. von 1907. Apparate zur Samenkontrolle. (Zschr. 

 landw. Versuchsw. Oesterreich. 1907. 3 pp. 1 Abb.) 



Weinzierl, Th. von 1907. 26. Jahresbericht der kais. kgl. Samen- 

 kontroll-Station in Wien für das Jahr 1906. (Wien. 1907. 8°. 56 pp.) 



Weinzierl, Th. von 1907. Massnahmen zur Hebung des Futter- 

 baues, der Getreidezucht und des Flachsbaues in Niederösterreich 

 im Jahre 1906. (Publik, k. k. Samenkontr. Stat. Wien. 1907. 345. 21 pp.) 



Weinzierl, Th. von 1907. Ueber Streuwiesen. (Publik, k. k. Samen- 

 kontr. Stat. Wien. 1907. 346. 17 pp. 4 Taf.) 



Weinzierl, Th. von 1907. Vorschläge für eine einheitliche inter- 

 national gültige „Untersuchungsmethode und Normen" für Rüben- 

 samen. (Mitt. k. k. Samenkontr. Stat. Wien. 1907. 353. 11 pp.) 



Wheeler, W. A. and S. Balz. 1907. Forage Plants at the High- 

 more Substation for 1906. (Bull. North Dakota agric. Expt. Stat. 

 [Brookings, N. D.], 1907. 101. p. 130—153. figs. 1—5 and Vignette 

 on title page.) 



Wheeler, H. J„ B. L. Hartwell, J. W. Kellog and M. Steel. 

 1907. Concerning the Functions of Sodium Salts. (Annual Rept. 

 Rhode Island agric. Expt. Stat. [Kingston, R. L] XIX. p. 186—316.) 



Whitson, A. R. and C. W. Stoddart. 1907. Soil Acidity in its 

 Relation to lack of Available Phosphates. (Journ. amer. ehem. 

 Soc. XXIX. 5. p. 757—759.) [All aeid soils lack available phosphoric 

 aeid. Indian com was used as an indicator plant in pot eultures. — 

 W. T. Swingle.] 



Wight, W. F. 1907. The History of the Cowpea and its Introduc- 

 tion into America. (Bull. Bur. Plant Ind. U. S. Dept. Agric. 

 Washington. 1907. 102. 6. p. 1—21. pls. 1—3.) 



Williams, C. B. 1907. A Million Dollars for a Grain of Com. (Far- 

 ming III. 4. p. 131 — 133. 6 ills.) [Importance of seed selection, notes 

 on best varieties, photograph of typical kerneis of 17 leading va- 

 rieties. Discussion of varieties adapted to southern states. — W. T\ 

 Swingle.] 



Williams, C. G. and C. H. Kyle. 1907. Alfalfa in Ohio. (Bull. 

 Ohio agric. Expt. Stat. Wooster, O. 1907. 181. p. 111—135. Vignette 

 on cover.) [Methods of seeding, use of nurse crops, liming, manu- 

 ring, experience of Ohio farmers with alfalfa. — W. T. Swingle.] 



Wilson, W. and H. G. Skinner. 1907. The Feeding Value of 

 Spelt in Beef and Pork Production. (Bull. North Dakota agric. 

 Expt. Stat. [Brookings, N. D.] 1907. 100. p. 116—129. 1 pl. [In 1904 

 2,952,214 busheis (1,040,339 hectoliters) of speit (Triticum dicoecum) 

 were produced in North Dakota, while less than twice as much 

 indian com was grown. One pound of com is equal to one and 

 onefourth pounds of speit for steer-feeding. The chemical analysis 

 of husk and grain showed 11.58 per cent. crude protein (1.84°/ 

 nitrogen) in air dry substance. — W. T. Swingle.] 



Witmack, L. 1907. Solanum Commersoni (the Swamp Potato). (R. 

 Hort. Soc. Report of the Conference on Genetics 1907. 3 pp.) 



Woodbury, C. G. 1907. Reclaiming an unprofitable Orchard. (Far- 

 ming. III. 3. p. 96—97. 9 ills.) [Illustrated directions for top graf- 

 ting apple trees. — W. T. Swingle.] 



