PART III. BEI TERINCK, THE MICROBIOLOGIST 



by 

 A. J. K 1 u y v e r 



Page 



Introduction 



Chapter XIX. The birth of the microbiologist 100 



XX. Growth and maturation of the microbiologist 102 



,, XXL A more detailed appreciation of Beijerinck's main con- 

 tributions to microbiology 106 



a. The isolation and investigation of Bacillus radicicola . 106 



b. Free oxygen in its relation to the vital phenomena of 

 fermentation organisms 1 09 



c. Studies on luminous bacteria Ill 



d. Pure cultures of algae, zoochlorellae, and goniclia of 

 lichens 114 



e. Studies on yeasts 114 



/. Beijerinck's contribution to the virus concept. ... 118 



g. Investigations on lactic acid bacteria 121 



h. Investigations on the natural group of butyric acid 



and butyl alcohol bacteria 1 25 



i. The genus Aerobacter Beijerinck 128 



/. Investigations on Sarcina ventriculi 130 



k. Investigations on acetic acid bacteria 132 



/. On sulphate reduction 134 



m. On denitrification 136 



n. On nitrogen fixation by free-living micro-organisms . 138 



o. Investigations on urea-decomposing bacteria .... 144 

 p. Bacillus oligocarbophilus, an agent of the biological 



purification of the air 146 



q. Studies on microbial variation 148 



The envoy 153 



APPENDICES 



Page 



A. The "Stellingen" accompanying Beijerinck's doctorate thesis. . . 157 



B. List of Beijerinck's assistants in his academic period 160 



C. List of communications from the Laboratory for Microbiology at 

 Delft, published by Beijerinck's collaborators in the years 1 895-1 92 1 . 161 



D. List of Doctor's Theses, wholly or largely prepared under Beijerinck's 

 direction 165 



E. Addresses made on September 30th, 1905 at the presentation 

 of the Leeuwenhoek Medal of the "Koninklijke Akademie van 



