100 THE DATA OF BIOLOGY. 



be regarded as progressive or continuous adjustments of in 

 ternal relations to external relations. So that not only does 

 the definition, as thus expressed, comprehend all those activi 

 ties, bodily and mental, which constitute our ordinary idea of 

 Life; but it also comprehends both those processes of de 

 velopment by which the organism is brought into general fit 

 ness for such activities, and those after-processes of adapta 

 tion by which it is specially fitted to its special activities. 



Nevertheless, so abstract a formula as this is scarcely 

 fitted for our present purpose. Reserving it for use where 

 specially appropriate, it will be best commonly to employ its 

 more concrete equivalent to consider the internal relations 

 as &quot; definite combinations of simultaneous and successive 

 changes;&quot; the external relations as &quot; co-existences and se 

 quences ; &quot; and the connexion between them as a &quot; corre 

 spondence.&quot; 



