U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY— BULLETIN NO. 121. 



•B. T. GALLOWAY, Chief of Bureau. 



MISCELLANEOUS PAPERS 



I. THE SUPPOSED RELATIONSHIP OF WHITE SNAKEROOT TO MILKSICKNESS, 



OR "TREMBLES." 



By ALBERT C. CRAWFORD, Pharmacologist, Poisonous- Plant Investigations. 



II MOUNTAIN LAUREL, A POISONOUS PLANT. 



By ALBERT C. CRAWFORD, Pharmacologist, Poisonous- Plant Investigations. 



III. RESULTS OF LOCO-WEED INVESTIGATIONS IN THE FIELD. 



By C. DWIGHT MARSH, Expert, Poisonous- Plant Iivextigations. 



LABORATORY WORK ON LOCO-WEED INVESTIGATIONS. 



By ALBERT C. CRAWFORD, Pharmacologist, Poisonous- Plant Investigations. 



IV. THE SOURCES OF ARSENIC IN CERTAIN SAMPLES OF DRIED HOPS, 



By W. W. STOCKBERGER, Expert, Drug- Plant Investigations. 



V. APPLE LEAF-SPOT CAUSED BY SPHAEROPSIS MALORUM. 



By W. M. SCOTT, Pathologist, and JAMES B. RORER, Assistant Pathologist, 

 Investigations of Diseases of Fruits. 



VI. THE IMMUNITY OF THE JAPANESE CHESTNUT TO THE BARK DISEASE, 



By HAVEN METCALF, Pathologist in Charge of the 

 Laboratory of Forest Pathology. 



Issued April 18, 1908. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE, 



1908. 



