STOCK-KILLING PLANTS 7 



tion of the nose and throat. Severe coughs are the result of the inhalation 

 and accumulation of the star-like hairs in the respiratory passages. See 

 Gardeners' Chronicle 3d. Ser. Ill, 370, March 24, 1888. 



BIBLIOGRAPHY 



BRITTON, N. L. and BROWN, ADDISON: An Illustrated Flora of the Northern United 

 States, Canada and the British Possessions, second edition, volumes I and II. 

 Genera Bromus, Cenchrus, Hordeum, Stipa, Trifolium. 



COVILLE, F. V.: Crimson Clover Hair-balls, Circular No. 8, Div. of Botany, U. S. De- 

 partment of Agriculture, June 15, 1895. 



HARSHBERGER, JOHN W. : A Review of Our Knowledge of Phy tobezoars. The Journal 

 of Comparative Medicine and Veterinary Archives, xix, 143, March, 1898. 



KERNER VON MARILATJN, ANTON and OLIVER, F. W. : The Natural History of Plants. 

 Half Volume II, 616-620. 



PAMMEL, L. H. : A Manual of Poisonous Plants. Part II, 1911, pages 262-266; 336-369. 



PEARSON, LEONARD and RAVENEL, M. P.: A Case of Pneumonomycosis Due to Asper- 

 gillus Fumigatus. University Medical Magazine, August, 1900. 



ROBINSON, B. L. and FERNALD, M. L.: A Handbook of the Flowering Plants and Ferns 

 of the Central and Northeastern United States and Adjacent Canada. (Gray's 

 New Manual of Botany, 7th edit., 1908.) Same genera as in Britton and 

 Brown. 



STRASBURGER, EDWARD: Rambles on the Riviera. English translation by O. and B. C. 

 Casey, 1906, 411-412. 



TRELEASE, WILLIAM: Cactus Hair Balls. Transactions of the Academy of Science of 

 St. Louis, vii, 493, Nov. 30, 1897. 



LABORATORY WORK 



Suggestions to Teachers. Cultures of Aspergillus fumigatus should be kept on 

 nutrient agars in test tubes as stock material. Fresh transfers of this fungus should 

 be made at least once every two months throughout the year. Such stock material, 

 allowing sufficient time for new growth to take place after inoculation of fresh agar, 

 can be kept conveniently in the ice box, or refrigerating plant, of the laboratory. When 

 the culture is used for laboratory study by the class, transfers should be made to slices 

 of wet bread fitted into Petri dishes and sterilized in the autoclave before use. Asper- 

 gillus fumigatus makes a rapid growth on the surface of the bread and is removed 

 easily for examination by the members of the botanical class. 



Dried specimens of the injurious higher plants should be kept between folded news- 

 papers, having been collected for the purpose during the growing and flowering season. 

 Some of the material at the discretion of the teacher can be preserved in alcohol, or 

 formalin. A number of hair balls should be kept on hand for the lecture table and for 

 detailed study by the class. 



