186 SCIENCE PROGRESS 



theory, as stated by Prof. Strong, is " the identification of 

 the existence known to us in sense-perception, when what we 

 perceive is the brain-process, with the existence known in 

 introspection." The argument is technical and difficult, but 

 it is carried out on a strictly scientific basis. It still shows, 

 perhaps, a tendency to regard mind too much as a thing, rather 

 than a process : too much as an organ, rather than a function. 



Dualism, which is thus losing favour in psycho-physiology, 

 has lost favour still more rapidly in other departments of 

 philosophy. The old distinction between noumena and phe- 

 nomena is abandoned by most philosophers. The new logic 

 and the new psychology both lead to monism. In philosophy, 

 as in physics, analysis discloses at the bottom a fundamental 

 unity, in place of a superficial diversity. 



Much discussion has been stimulated by the issue of Brain 

 for September 191 8, in which the whole number is devoted to 

 a single paper by Dr. Henry Head on Sensation and the Cerebral 

 Cortex. A description of this paper does not lie within the 

 purview of the present review ; of the many important philo- 

 sophical corollaries flowing from it there need only be men- 

 tioned the illustrations given of a gradual merging of the 

 physiological into the psychical : the condemnation of the 

 introspective method, owing to the fact that the elements of 

 sensation are prepared in a physiological underworld which 

 never attains the sphere of consciousness : and the division 

 of sensation into three aspects (a) recognition of spatial rela- 

 tions ; (b) a graduated response to stimuli of different in- 

 tensity ; and (c) appreciation of similarity and difference in 

 external objects. This paper indicates the final and complete 

 subordination of psychology, which is established as a special 

 branch of physiology. 



Students of Freud will welcome the new revised and en- 

 larged edition of Papers on Psycho- Analysis by Dr. Ernest 

 Jones (Bailliere, Tindall & Cox, 191 8). This work contains 

 twenty-one new chapters added since the previous edition, 

 which has been out of print for over three years. Dr. Jones 

 is one of the small school who still remain whole-hearted 

 believers in the Freudian doctrine ; and his book constitutes 

 by far the bes£ account in the English language of that par- 

 ticular school of Psychology. 



Another important publication is the authorised transla- 



