CONTENTS xix 



CHAPTEK XXV 



PAGE 



1894. Pfeiflfer's experiments — The Buda-Pest Congress — 

 Extracellular destruction of microbes — Beaction of the 

 organism against toxins — Dr. Besredka's researches — 

 Macrophages — The Moscow Congress — Bordet's experiments 158 , 



CHAPTEE XXVI 

 1900. Immunity— i-Natural immunity — Artificial immunity . 168 



CHAPTEE XXVII 



1893-1905. Private sorrows — Death of Pasteur — Ill-health 

 — Senile atrophies — Premature death — Orthobiosis — 

 Syphilis (1905) — ^Acquisition of anthropoid apes (1903) . 181 



CHAPTEE XXVIII 



Eesearches on the intestinal flora — Sour milk . . .196 



CHAPTEE XXIX 



1908. The Nobel Prize — Journey to Sweden and Russia — A 



day with L^on Tolstoi . . . . .199 



CHAPTEE XXX 



Intestinal flora — Infantile cholera — Typhoid fever — Articles on 



popular Science . ■. . . . 206 



CHAPTEE XXXI 



1911. Expedition to the Kalmuk steppes tostudy tuberculosis — 



Plague ....... 210 



CHAPTEE XXXII 



Further researches on the intestinal flora — Forty Year^ Search 



for a Rational Conception of Life . . . 220 



