DIVISION OF BOTANY. 99 



explorers of the Department, of the culture of the high-grade hops of 

 Saaz and Auseha, the two most noted hop-growing districts of Bohe- 

 mia. It contains much useful information for those experimenting 

 with the introduction of these hops into the United States. 



No. 20, Horse-radish Culture in Bohemia, by David G. Fairchild, 

 issued January, 1900. This contains an account of the culture of the 

 Maliner horse-radish of Bohemia, where the culture of this plant has 

 reached a high state of perfection and where specially selected varieties 

 have been developed. Some of these promise to be useful introduc- 

 tions for the United States. 



No. 21, Yams in the West Indies, by David G. Fairchild, issued 

 January, 1000. This circular contains an account of the cultivation 

 of some of the best varieties of yams in different x^ai'ts of the West 

 Indies. It was issued not only to show what might be done in some 

 of the tropical dependencies of the United States, but also to call 

 attention to these vegetables as possible additions to the import mar- 

 ket of the United States. 



No. 22, Bur, or Globe, Artichokes, by Walter T. Swingle and David G. 

 Fairchild, issued Februarj', 1900. An account of the globe artichoke, 

 which forms one of the most delicious vegetables in southern Europe, 

 but the use of which in the United States is as yet very limited. It 

 is believed that some of the best varieties of this vegetable will 

 become important additions to the truck-growing industries of the 

 south Atlantic States. 



No. 23, The Lebbek or Siris Tree, by David G. Fairchild, issued 

 March, 1900. An account of the lebbek tree, which is used largely for 

 shade and as a i^rotection to irrigation ditches in Egypt and other 

 tropical countries. It is suitable for introduction into the warmer 

 parts of the United States where only slight frosts occur. 



No. 24, Red Clover Seed, by A. J. Pieters, issued March, 1900. This 

 is an account of some of tlie ordinary defects of red clover seed, with 

 instructions to the farming community how to ascertain the quality 

 of the seed before it is planted. 



No. 25, The Seed of Beardless Brome Grass, by A. J. Pieters, issued 

 April, 1900. The introduction of this grass into the semiarid portions 

 of the United States has shown it to be a forage plant of very great 

 value, and the demand for the seed has enormously increased within 

 the past few j^ears. It is found, however, from testing a large num- 

 ber of samples, that most of the brome-grass seed imported from for- 

 eign countries and offered for sale in the United States is low in ger- 

 mination or contains a large amount of injurious weed seeds, or has 

 both these defects. This circular brings out the important fact that 

 the brome-grass seed produced in the United States is of far better 

 quality than the imported j)roduct. 



No. 26, Egyptian Cotton in the United States, b}'^ Lyster H. Dewey, 

 issued April, 1900. This publication points out the value of the 

 Egyptian cotton imported into the United States, which varies from 

 $0,000,000 to $5,000,000 per year, gives an account of experiments with 

 the varieties alreadj^ tried in the United States, and compares the 

 climatic and other cultural conditions of the American districts with 

 those of the Nile region. 



No. 27, Canada Thistle, by Lyster H. Dewey, issued June, 1900. 

 This is an account of the damage caused b^^ the Canada thistle, with 

 information as to the best method of eradicating the pest. 



