NOTES AND ABSTRACTS. 755 



Arizona, A Protected Stock Rang-e in. By D. Griffiths {U.S.A. 



Dep. Agr., Bur. PI. Ind., Bull. 177, Apr. 1910).— An area on the 

 stock ranges, which had been very closely grazed, was enclosed by a 

 fence some years ago. The grazing greatly improved, so that at 

 the end of about three years it was as good as it was originally. 

 Perennial plants are gradually supplanting annual ones, but one or two 

 weeds are more than holding their own, especially Isocoma coronopi- 

 folia and Lupinus arizonicus, the latter being particularly troublesome, 

 for horses are greatly injured by it. Of introduced plants, only 

 Erodium cicutarium (alfilerilla) holds its own along with a few native 

 plants that have been sown. The shrub Prosopis glandulosa, and others, 

 are increasing rapidly over both the enclosed and grazed areas, and 

 proving great impediments to mowing. The author considers the 

 increase of shrubby vegetation to be chiefly due to checking fires. 



F. J. C. 



Aroids, History and Utility of Cultivated. I. Yantias, 

 Taros, and Dasheens. By 0. N. Barrett. II. Ag-ricultural His- 

 tory and Utility of. By O. F. Cook {XJ.S.A. Dep. Agr., Bur. PI. 

 Ind., Bull. 164, Feb. 1910; 10 plates).-— Part I. contains information 

 regarding the different species and varieties of Xanthosoma, Colocasia, 

 and Alocasia likely to prove of use as cultivated crops in Southern 

 States with aids to distinguishing the different species. They are used 

 for salad plants and the production of starch and alcohol. 



Part II. deals with the ancient history and questions of introdaction 

 to America of these Aroids. — E. A. B. 



Arrowhead, The Double-flowered {Garden, Feb. 5, 1910, 



p. 67; fig.). — This is to be planted in the mud in water 6 inches to 

 1 foot deep. By planting six or more roots together an imposing effect 

 is obtained. — H. R. D. 



Azalea Disease : Its Spread to Schleswigr-Holstein. By 



I Dr. Ewert {Zeitschr. f. Pflanzenkranlc. xix. 1909, Heft 6, p. 321).— 

 Eecords the appearance of the fungus Septoria Azaleae occurring 

 for the first time in this part of Germany. The fungus was first 

 described in Italy by Voglino, and the affected leaves, which become 

 brown, were in this case examined by him and pronounced to be 

 attacked by this fungus. Pycnidia were absent, and even in Italy are 

 seldom found. In a second season one of the two previously attacked 

 plants was observed to be suffering apparently from a recurrence of 

 the same disease. It was found, however, that no fungus was present, 

 and that the plant was only suffering from want of water, the symptoms 

 of which were very similar to those produced in the previous year by 



\ Septoria Azaleae. — G. H. P. 



Bacteria, Classification of. By H. A. Harding {U.S.A. E.ip. 



\Stn. New York, Tech. Bull. 13, June 1910).— The author has tested 

 the cultural characteristics of forty-four strains of the bacteruim 



I 



