RESEARCH SEMINAR. 



physiological action of any salt is equal to the sum of the actions 

 of the two ions. 



In the toxic and antitoxic action of salts as described by Loeb, 

 both the anion and the cathion are of importance. There is no. 

 simple relationship of antitoxic action between monovalent and 

 bivalent cathions. 



July 31. The Cranial Nerves of Squalus acanthias. By O. 



S. STRONG. 



The object of the work is to confirm, using serial sections, the 

 partial analysis of the cranial nerves into their components ac- 

 complished by means of gross dissection by previous investigators, 

 and to extend that analysis further. The components are found 

 to be the same and to have the same general typical arrangement 

 as in other vertebrate types. The trigeminus is purely " general 

 cutaneous." The facialis has four roots : two lateral line roots 

 (R. ophthalmicus superficialis, buccalis, mandibularis externus, 

 etc.) distributed to the canal and ampullary organs of the head, 

 one communis root to the mouth (R. palatinus, mandibularis 

 internus, etc.) and one motor root. The post-auditory roots are 

 the lateral line root, including also a small separate root to one 

 or two canal organs via the glossopharyngeus, a series of com- 

 munis roots and a series of motor roots. The communis roots 

 are distributed into the pre- and post-branchial and visceral 

 branches, innervating the branchial cavities, pharynx and viscera. 



July 31. A Case of Almost Complete Absence of the Left 

 Cerebellar Hemisphere in the Brain of a Child Three Years 

 and Four Months Old. By O. S. STRONG. 

 The external appearances have been reported elsewhere (Jouni. 

 Couip. Ncnr., Vol. XL, No. i). The sections show the follow- 

 ing principal abnormalities : absence, usually complete or nearly 

 so, of the right olive and the cerebello-olivary fibers connected 

 with it, of the left restiform body, of the transverse pontine fibers 

 to the left cerebellar hemisphere, of the right nucleus pontis and 

 of the left superior peduncle. The \efc.formatio rcticidaris con- 

 tained more longitudinal fibers than the right. The left lem- 

 niscus showed some degeneration and the left corpus quadri- 

 gcinimnn anterior was much smaller than the right. 



