540 Journal of Comparative Neurology and Psychology. 



the frog, in which it is shown that the reflex follows only from a specific 

 quality of stimulation, and that this arrangement is biologically use- 

 ful to the animal. j. c. b. 



Scafridi, Vittorio. Sulla presenz* di fibre efferenti nelle radici posteriorie e sulla 

 origine delle fibre vasoraotorie che si trovano in esse. Archivio di Fisiol- 

 ogia, Vol. I, pp. 586-603, 1904. 



A good review of the literature on the posterior roots and an ac- 

 count of seven experiments on dogs, from which it appears that no 

 true Wallerian degeneration follows an incision, that the degeneration 

 observed is traumatic, and that therefore we are not justified in assum- 

 ing the presence of efferent fibers. Further researches are necessary 

 to settle the question of the origin of the vasomotor fibers found there. 



J. c. B. 



Parker, G. H. The Reversal of Ciliary Movement in Metazoans. Amer.Jour. 

 Physiol. 13, 1-16, 1 905. 



The author has demonstrated that reversal of ciliary movement, 

 few instances of which are known among the metazoa, occurs in the 

 labial cilia of Metridium marginatum under certain conditions. Exper- 

 iments indicate that reversal is due to the action of potassium ions, in 

 case of the substances tested, and not to osmotic action or mechanical 

 stimulation. Reversal occurs only where the stimulus is applied, and 

 there is no evidence of a nervous reflex. r. m. y. 



Pick. Des zones de Head at leur importance en psychiatric. Journ. de psychol. 

 norm, et pathol., \, 1 13- 1 17, 1 904. 



An account of a case of interest particularly to psychologists in 

 showing that abnormal sensations may give arise to the most diverse 

 and peculiar interpretations. 



Some years ago Head pointed out that certain modifications of 

 skin sensibility accompany derangements of internal organs (so called 

 "zones of Head"). The case cited by Pick is that of a woman with 

 hyperaesthesia in the region of the left breast, and with ideas of perse- 

 cution, which, it was afterwards discovered, were due to the deranged 

 sensations. The region of hyperaesthesia corresponded to that for 

 the stomach, and further examinadon disclosed a dilatation of that or- 

 gan. Under treatment, in a few days there was an amehoration of 

 the stomach's condition and a disappearance of the delusions and sen- 

 sory disturbances. s. i. f. 



Wollenberg, R. Die Hypochondrie. Nothnagel's Specielle Pathologic und 

 Therapie. Bd. 12, Theil I, Abth. i,, pp. 66. Wim, Holder 1904. 



The author has given a satisfactory treatment of a very unsatisfac- 

 tory subject. There is a great difficulty, sometimes impossibility, of 



