1878.] 



Presents. 



Ul 



electrotonns, the known effect on the neutral line of varying battery 

 power, and the assumption of a stimulating influence of the current 

 per se, which may connteract the depressing effects of the anelectrotonic 

 state. 



On the spinal centre exhausted by the effects of operative proce- 

 dure, exposure, etc. "Restoration to activity follows the passage up or 

 down the cord of a current for 1-2 Grove's cells. Such restoration 

 the author does not think it possible to attribute in every case to the 

 presence of favouring katelectrotonus ; it must be set down to a stimu- 

 lation by the current per se. 



7. On the spinal centres of hearts inhibited by stimulating with strong 

 NaCl solutions the upper exposed end of the cord of a decapitated 

 frog. The electrodes were inserted into the spinal canal through 

 windows in the 5th and 7th or 8th vertebral arches. Under these 

 circumstances the hearts cannot be set going by passing a current 

 through the spinal centres, unless, perhaps, when the current is very 

 strong (from 5-6 Grove's) ; and then only when the anode is above the 

 spinal centres, and, therefore, in a. position to intercept the descending 

 inhibitory stimulus by means of the anelectrotonic state which it 

 induces. 



IV. " On the Structure of the Stylasteridse, a Family of the 

 Hydroid Stony Corals." By H. N. Moseley, F.R.S., Fellow 

 of Exeter College, Oxford, late Naturalist on board H.M.S. 

 ' Challenger.' Received January 22, 1878. 



[For " Preliminary Note," see Proceedings, vol. xxv. p. 93.] 



Presents, January 10, 1878. 



Transactions. 



Basel: — Schweizerische Naturforschende Gesellschaft. Verhand- 

 iungen. 59 Jahresversammlung. 8vo. 1877. The Society. 



Berlin : — Konigliche Akademie der Wissenschaften. Abhandlungen 

 aus dem Jahre 1876. 4to. 1877. The Academy. 



Bern : — Naturforschende Gesellschaft. Mittheilungen aus dem 

 Jahre 1876. Nr. 906-922. 8vo. 1877. The Society. 



Berwickshire Naturalists' Club. Proceedings. Vol. VIII. No. 1. 

 8vo. 1877. The Club. 



Bombay Branch of the Royal Asiatic Society. Journal. Vol. XII. 

 No. 34. 8vo. 1877. The Society. 



Boston [U.S.] : — American Academy of Arts and Sciences. Pro- 

 ceedings. Vol. XIII. Part I. 8vo. 1877. The Academy. 



