UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 20, No. 19, pp. 409-430, plates 38-39 October 31, 1923 



EXPERIMENTAL INFECTION OF RATS AND 



MICE WITH THE COMMON INTESTINAL 



AMOEBAE OF MAN 



BY 



JOHN F. KESSEL 



CONTENTS 



PAGE 



A. Introductory and historical 410 



B. Feeding experiments 411 



I. Materials and methods 411 



II. Tables and conclusions 412 



Table 1. Rats fed with E. dysenteriae 413 



Table 2. Mice fed with E. dysenteriae and C. lafieuri 414 



Table 3. Rats fed with E. coli 415 



Table 4. Rats fed with C. lafieuri, E. nana, and /. biitschlii 416 



Table 5. Rats fed with E. coli, and C. lafieuri 417 



Table 6. Rats fed with E. dysenteriae, E. coli, and C. lafieuri obtained 



from other rats 419 



III. Effect on cysts of passage through digestive tract 419 



Table 7. Results from autopsying rats and mice fifteen hours after 

 feeding cysts of .E. dysenteriae axiA C . lafieuri 420 



C. Discussion 421 



I. Specificity of parasites to a given host 421 



II. Factors involved in establishment of a parasitic infection by amoebae 422 



III. Application of cross-infection experiments from the point of view of 



medical zoology 423 



IV. Morphological constancy of parasites in cross-infection experiments 424 



D. Summary 424 



E. Literature cited 426 



F. Plates and explanations 428 



