504 



Marine Microbiology 



Fig. 1 Diagram showing the similarity vakies (S) of a series of Pseitdomonas 

 spp. isolated from marine sources, 



fluorescent pigment and have no action on glucose but produce 

 an alkaline reaction in Hugh and Leifson's medium, whereas 

 Group IV produces no change at all. 



Groups II, III and IV correspond to one of the Achromohac- 

 ter groups recently postulated by Brisou (7) in his suggested 

 classification of the Pseudomonadeceae. 



As many of you are aware, Sneath (50, 51) has recently sug- 

 gested that the most logical way of classifying bacteria is to 

 compare their overall similarities, applying the Adansonian 

 principle of giving equal weight to each character. It is of in- 

 terest, therefore, to examine the application of this principle to 



