180 The Plant World. 



to Plant Breeding. Discussion of Plant Bieading Methods 

 Practiced in America and Europe. 



Dr. H. J. Webber: General Princij:les of Plant Breeding. 



Agronomy. 



Dr. C. G. Hopkins: The Meaning of Soil Analysis. The 

 Permanent Maintenance of Soil Fertility. Methods of Soil 

 Investigation and Interpretation of Results. 



Dr. J. G. Lipman: The Soil as a Culture Medium (Two 

 lectures.) The Quantitative Estimation of Bacterial Changes 

 in the Soil (Two lectures.) Bacterial Activities in their Re- 

 lation to Soil Management. 



Prof. C. V. Piper: Soil Variation as a Factor in Field Ex- 

 periments. Plant Variation as a Factor in Field Experiments. 

 The Essentials of a Field Experiment. The Recording and Pub- 

 lication of Field Experiments. Methods of Obviating Minor 

 Errors in Field Experiments. 



Dr. L. H. Smith: Some Results Accomplished by Selec- 

 tion. Some Fundamental Problems of Selection. 



Prof, W. H. Stevenson: Undergraduate courses in Soils. 

 Some Physics Problems. Data Regarding Some Special Soils. 



Dr. S. L. Jodidi: Humus with Special Reference to Soil 

 Nitrogen (Two lectures.) 



To the above will be added lectures on horticultural sub- 

 jects by a number of well-known specialists. 



