x TABLE OF CONTENTS 



XII. PATHOLOGICAL HISTOLOGY IN GUINEA-PIGS 194, 



1. Description of Tissues 194 



(a) The central nervous system 194 



(6) The skin 195 



(c) The heart 195 



(d) The lungs 195 



(e) The spleen 196 



(/) The liver 196 



(g) The gastro-intestinal tract 197 



(Ji) The pancreas 197 



(i) The kidneys 197 



(j) The adrenals . . . 197 



(k) The skeletal muscles 197 



(0 The uterus and ovaries 197 



(m) The testes 197 



2. Rickettsia in Guinea-pig Tissues 198 



XIII. SUMMARY AND CONCLUSIONS 199 



XIV. BIBLIOGRAPHY 203 



XV. DESCRIPTION OF PLATES . 210 



