1 82 Journal of Comparative Neurology. 



profound sleep, even the hemispheres may remain active ; we 

 may dream unconscious dreams, which is proved by the fact 

 that the motor regions may, as is the case in sleep-walking, 

 perform their usual routine work. Sleep does not necessarily 

 imply the stoppage of all work in the brain, but always that the 

 psychical activities are no longer co-ordinated ; and this lack of 

 co-ordination renders them not unfeeling, but unconscious. 



Consciousness, accordingly, is a complex state of many 

 co-ordinated feelings, and their peculiar combination at a given 

 time determines the nature of the reaction that will take place 

 under given circumstances. Sense-reports of common occur- 

 rence are treated with indifference, while some weak and almost 

 unimpressive feelings which, however, according to the knowl- 

 edge stored up in the memories of the past are freighted with a 

 significance that indicates the presence of great danger, might 

 cause a storm of excitement and rouse all the latent energies in 

 all the various parts of the brain. 



A living body consists of a great number, .indeed an infin- 

 itely great number of living beings. Every blood corpuscle is 

 a little creature having an independent life of its own and a soul 

 corresponding to the form and activity of its structure; for we 

 must attribute to it a similar kind of life and sentiency as to 

 analogous organisms, amcebas and moners, — a consideration 

 which leads us to recognise the truth that our whole organism is 

 glowing with life of which the ego of our consciousness knows 

 nothing. 



If feelings could be made audible what a symphony a hu- 

 man body would be! All notes of life, from the lowest to the 

 highest are here harmoniously joined so that one serves the 

 others and all of them in their grand harmony bring about a 



Fig. i. Meynert's diagram of the nervous system. CC, Cortex of the 

 hemispheres; Z, Lenticular body; S, Nucleus caudatus ; T, Thalamus; V, Cor- 

 pora Quadrigemina; Ji, Olfactory nerve; a, Eye; K, Cerebellum ; B, Brachium 

 and Cerebellum ; hW, posterior or sensory roots of spinal cox&vW, anterior or 

 motory roots of spinal cord ; AIM, sections of medulla , it, voluntary tracts; 

 2-2, Involuntary tracts; 3-3, Sensory tracts; 4-4, Optic tracts; 5-5, Olfactory 

 tracts; 6-6, Cerebellar tracts; 7-7, Commissural fibers connecting both hemis- 

 pheres; 8-8, Commissural fibers interconnecting regions of the same hemsphere. 



