Kleinere Mitteilungen. I27 



« 



Therefore correlation is altogether out of the question. Concerning the 

 decision of this question I refer to my former observations. For the sake 

 of a more lucid standpoint towards the concept of correlation in general 

 I had previously pointed out that it is important in this question to make 

 a decisive conclusion with regard to the very marked difference in the very 

 varied phenomena, phenomena which have nothing to do with each other, 

 which nevertheless are comprised in the same notion of correlation. I then 

 gave the consideration to give the classic term "correlation" solely to 

 that phenomenon what was in all times considered as the greatest riddle, 

 and as such has made the greatest impression and that has now disclosed 

 itself as being a bond of the properties originated by these properties as 

 being expressions of one and the same gene. Let us then give the term 

 reciprocal relation of parts to the phenomenon of the relation of parts 

 in general; what concerns the influence of external circumstances in so far 

 as this influence is a conformable one for the parts concerned, to know a 

 conformably good or a conformably bad influence, so that that influence 

 is not so much an expression of a connection of parts as indeed of a 

 reacting in the same way of the same circumstances: and to this 

 phenomenon we might give the name of congruence of properties. A large 

 group of phenomena, to which e. g. the physiological, "Compensation" and 

 many other reciprocal influences which to the present time have been 

 reckoned as belonging in a restricted sense to the sphere of the physiology 

 of stimulation. These phenomena are of an energetic nature. I have pre- 

 viously thoroughly explained the principles which lie at the foundation of 

 these phenomena. It is impracticable in this place to once more explain 

 the somewhat intricate phenomenon, so that I shall only refer to my trea- 

 tise of last year concerning this matter 1). This whole group of phenomena 

 must be collected under one heading, for which I would wish to propose 

 the term "coherence" of properties. 



So we must once more focus together the analyses of the "so called 

 correlation" concept in a general sense in a surveyable form, then we have, 



Correlation; the properties are 

 the expressions of one and 

 the same gene. * 



Mutual influence 

 (= Wechselwirkung) 



Congruence; the different proper- 

 ties reacting on external 

 influences in a conformable 

 manner. 



Coherence; the properties stand in 

 energetic mutual relation 

 to each other. 



Buitenzorg (Java), April 1913. 



1) Über den Reizbegriff und dessen Analyse. (Publications sur la Physiologie 

 Vegetale. Macdonald. Nimegue. 1912.) 



