124 PHYSIOLOGY CHAP. 



accompany the compensatory movements must, according to Ewald, 

 be considered as a special instance of corrective reflexes spreading 

 over a large part of the musculature. 



One last peculiarity remains to be noted in regard to the 

 sensory functions of the non-acoustic labyrinth. As we have seen 

 that under normal conditions the cerebellum is the seat of sub- 

 conscious sensations, so the sensations of position and of normal 

 movement normally aroused by the labyrinth in the cerebellum 

 and bulb must be of the same kind when once it is admitted that 

 this part of the brain contains its reflex centres. The sensations 

 of rotatory and galvanic vertigo that can be experimentally pro- 

 duced in man by the methods of Mach and of Purkinje and Hitzig, 

 and which are absent in deaf-mutes in whom the labyrinth is 

 unable to function, are certainly not of this kind. They prove 

 that the normally sub-conscious cerebellar sensations may, under 

 certain experimental conditions, be so heightened and altered that 

 they pass the threshold of consciousness and are clearly perceived 

 in the form of rotatory vertigo and galvanic vertigo. This is an 

 interesting complement to our own theory of the cerebellum, 

 which is derived from the ingenious researches of the last twenty 

 years into the physiology of the non-acoustic labyrinth. 



BIBLIOGRAPHY 



For the earlier literature of the subjects treated in this important chapter the 

 student should consult the classical Text-books of JOH. MULLER, LONGET, 

 HERMANN, as well as WAGNER'S Dictionary (articles by PURKINJE and WEBER). 

 For the copious modern literature the reader will find numerous quotations in 

 SCHAFER'S and NAGEL'S Text-books. 



Common Sensation and Internal Pain : 



BEAUNIS. Les Sensations internes. Paris, 1889. 

 RICHET. Dictionnaire de PhysioL, art. "Douleur." Paris, 1902. 

 LENNANDER. Mitteilungen aus den Grenzgeb. d. Med. u. Chir. x., 1902. 

 HEAD. Brain, 1893, xvi. p. 1 ; 1894, xvii. p. 339 ; 1896, xix. p. 153. 



Hunger and Thirst : 



BRACKET. Recherches sur les fonc. d. syst. nerv. Paris, 1837. 

 SCHIFF. Le9ons sur la digestion. Florence, 1867. 

 SCHLESINGER. Wien. klin. Wochenschrift, 1887. 

 LUCIANI. Fisiol. del digiuno. Florence, 1889. 

 BARDIN. Richet's Dictionary, art. "Faim." 1904. 



Sexual Wants : 



SPALLANZANI. De la generation, etc. Geneva, 1786. 

 GOLTZ. Function d. Nervencentr. d. Frosches. Berlin, 1869. 

 TARCHANOFF. Pfliiger's Arch, xl., 1887. 

 BEAUNIS. Les Sensations internes. Paris, 1889. 

 SFAMENI. Arch, di fisiol. i. Florence, 1904. 



Muscular Innervation Sense and Active Touch : 



WEBER. Wagner's Handwort. iii., 1846. 

 DUCHENNE. Conscience musculaire. Paris, 1859. 

 BAIN. The Senses and the Intellect. 1864. 



