UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 767 
Contribution from the Bureau of Animal Industry 
; JOHN R. MOHLER, Chief 
Washington, D. C. PROFESSIONAL PAPER April 28, 1919 
OAK-LEAF POISONING OF DOMESTIC 
ANIMALS | 
By 
C. DWIGHT MARSH, Physiologist in Charge of Poisonous Plant 
Investigations, A. B. CLAWSON, Physiologist, and 
HADLEIGH MARSH, Veterinary Inspector, 
Bureau of Animal Industry 
CONTENTS 
Historical Summary and Review of Literature 
Poisoning by Oak Leaves in North America 
Experimental Work With Scrub Oak . 
Experimental Work With “Shinnery” Oak 
General Results of the Experineytal Work 
Symptoms : é - 2 + 
Autopsy Findings * 
Microscopic Pathology . 
Length of Time Necessary ta Peoducs ana Bien Oak Feeding 
Effect of eating oak withotherfeeds . . * 
Active Principie or Principles Causing Oak-Brush Poizoning 
Summary of Conclusions From Experimental Work 5 = 
Discussion of Results With Relation to Previous Investigations 
Practical Considerations fer Bi eee Ras : . 
Literature Cited 4 A 2 x . 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1919 
