PART III. BEIJERINCK, THE MICROBIOLOGIST 



by 



A. J. K ] u y V e r 



Page 



Introduction 99 



Chapter XIX. The birth of the microbiologist 100 



,, XX. Growth and maturation of the microbiologist 102 



„ XXI. A more detailed appreciation of Beijerinck's main con- 



tributions to microbiology 1 06 



a. The isolation and investigation of Bacillus radicicola . 106 



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

 fermentation organisms 109 



c. Studies on luminous bacteria 111 



d. Pure cultures of algae, zoochlorellae, and gonidia 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 y4fro6ac^gr Beijerinck 128 



ƒ. 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 



purif ication of the air 1 46 



q. Studies on microbial variation 1 48 



Theenvoy..- 153 



APPENDICES 



Page 



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



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



C. List of Communications from the Laboratory for Microbiology at 

 Delft , published by Beij erinck ' s collaborators in the years 1 895- 1921. 161 



D. List of Doctor's Theses, whoUy 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 



