ex Journal of Comparative Neurology. 



the addition of unpleasant elements the feeling of pleasure becomes a 

 mixed feeling. The unpleasant element gradually increases at the ex- 

 pense of the pleasant. Finally we have a pure, unpleasant feeling. 

 When the excitation is not intermittent, Horwicz may be right. But in 

 the majority of cases Kroener thinks Wundt is right. 



Horwicz thinks that feeble excitations always cause pain. This can- 

 not be true, for tickling pleases many animals and children. 



Weber's law holds good for feelings as well as for sensations. 

 Wundt gives the following example: To the possessor of one hundred 

 thalers, the addition of one thaler gives as much pleasure as the addition 

 of ten thalers would give to the possessor of ten thousand. 



Vigorous nerve excitations produce joy. Very severe excitations 

 produce pain. Whether a nerve is excited feebly or strongly, depends 

 not only upon the nature of excitation, but also upon the condition of 

 the nervous system — upon habit and exercise. 



Physiology of the Sense Feeling. ' This is an almost unexplored field. 

 So far the only exact data appertain to the feeling of pain. Yet we have 

 two views upon the subject. 



Weber thinks that the sense feelings rest upon a radiation in the 

 brain of a nerve excitation. Lotze, on the contrary, thinks that the sense 

 feelings depend upon particular feeling-engendering nerve processes. 



Sometimes a person loses all feeling without a loss of sensation, and 

 vice versa. This leads us to consider the paths ef sensation stimuli and 

 of feeling stimuli through the myelon. In the myelon sensation stimuli 

 follow definite tracts, while the pain stimuli spread out over the grey 

 matter. Sectioning the lateral tracts in the cord destroys all sensation 

 for that portion of the body which lies beyond the injury. Sectioning 

 the grey matter in that portion of the myelon destroys all pain in the 

 same portion of the body. This discovery is due to Schiff. W^eber's 

 theory has never received a severer blow. It was a death blow. To re- 

 peat : I. The objective sense perceptions are conveyed only through the 

 lateral tracts of the myelon. 2. Weak excitations of the grey matter of 

 the cord give pleasure, while severe excitations of the same give pain. 



By longer endurance or stronger excition, any sense feeling may be 

 transformed into a general feeling. Not only this, but along with sense 

 feelings, general feelings often arise. 



It is a commonly accepted theory that the refunctioning of the same 

 nerve elements that were active when a sensation was first experienced. 



