SEA-FISHERIES LABORATORY. 



157 



Reactions of 72 organisms isolated from mussels. (These reactions 

 are not contained in the previous tables.) 



2 



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32 



7 

 7 

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63 





9 other organisms did not ferment both glucose and lactose. 



II. The graduation of the rough data of the Experi- 

 ments I, II and III (see pp. 128-133) 



It may be well worth while to discuss the method of 

 graduation of the rough figures obtained in the above 

 experiments, as they illustrate a frequent difficulty in biological 

 work involving series of numerical values. It is quite evident, 

 merely from a glance at the figures, that they are to be fitted 

 to a curve, the form of which is that of the rectangular hyper- 

 bola. 



But if we try to draw this curve, after plotting the points 

 represented by the figures, we shall find that to do this by 

 inspection is not easy ; and if we try it several times, without 

 looking at the graphs previously made, we may find that the 

 results are not the same. This is generally true of the method 

 of making curves representing biological statistics. The data 

 are rough, and allow us considerable latitude in making their 

 graphs. We can, quite unconsciously it may be, make these 



