28 MANUAL OF DETERMINATIVE BACTERIOLOGY 



Kluyver and Van Niel (Cent. f. Bakt., II Abt., 94, 1936, 369) have 

 developed an outline classification in which they indicate four lines of 

 development from the simplest form of cell that is existent and conceivable, 

 the sphere. They assign family rank to each of these four groups of bac- 

 teria, placing the lophotrichous (and related non-motile) rod-shaped bac- 

 teria first (Pseudomonadaceae) . This is followed by the family of spherical 

 bacteria (Micrococcaceae) and the family of permanently non-motile, rod- 

 shaped bacteria (Mycohacteriaceae) . The final family includes the peritri- 

 chous (and related non-motile) rod-shaped bacteria, the Bacteriaceae. 

 These are grouped in the tribes of each family in accordance with their 

 fundamental metabolism as photo-autotrophic,photo-heterotrophic,chemo- 

 autotrophic and chemo-heterotrophic. Their outline follows: 



