BULLETINS OF THE BUREAU OF PLANT INDUSTRY. 



The Bureau of Plant Industry, which was organized July 1, 1901, includes Vege- 

 table Pathological and Physiological Investigations, Botanical Investigations and 

 Experiments. Grass and Forage Plant Investigations, Pomological Investigations, and 

 Gardens and Grounds, all of which were formerly independent Divisions, and also 

 Seed and Plant Introduction, the Arlington Experimental Farm, Tea Investigations 

 and Experiments, and the Congressional Seed Distribution. Beginning with the 

 date of organization of the Bureau, the bulletins of Seed and Plant Introduction, 

 which were formerly published in the series of the Division of Botany, the last 

 number of which was 29, and also those of the other Divisions was discontinued, and 

 all are now published as one series of the Bureau. 

 The bulletins published in the Bureau series are: 

 Xo. 1. The Relation of Lime and Magnesia to Plant Growth, 1901. 



2. Spermatogenesis and Fecundation of Zamia, 1901. 



3. Macaroni Wheats, 1901. 



4. Range Improvement in Arizona, 1901. 



