Proceedings and List of Papers read. 359 



Throughout the experiments fallacies arising through induction were 

 carefully guarded against, the negative variation was tested by re- 

 versing the direction of the stimulating current ; and as a final test for 

 current escape the led-off nerve was cut through with wet scissors in 

 such a way that the severed ends remained in contact, though physiolo- 

 gical continuity was destroyed ; the stimulation was then repeated, 

 but in no case was there any deflection after such section. 



In the main my results exhibit 



I. Electrical effects of an indubitably reflex character in the mixed 



nerve and in the anterior roots alone. 

 II. Slight effects of doubtful character in the posterior roots. 



My warmest thanks are due to Professor Hering for the courteous 

 hospitality of his laboratory, and to Professor von Frey I would offer 

 my grateful acknowledgment of his ready help. 



February 23, 1899. 

 The LORD LISTER, F.R.C.S., D.C.L., in the Chair. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following Papers were read : 



I. "On the Order of Appearance of Chemical Substances at different 

 Stellar Temperatures." By Sir NORMAN LOCKYER, K.C.B., 

 F.R.S. 



II. " The Efficiency of Man, or Economic Coefficient of the Human 

 Machine." By Dr. W. MARCET, F.R.S., and R. B. FLORIS. 



III. "Some Experiments bearing on the Theory of Voltaic Action." 



By J. BROWN. Communicated by Professor EVERETT, F.R.S. 



IV. " Deposition of Barium Sulphate as a Cementing Material of Sand- 



stone." By Dr. F. CLOWES. Communicated by Professor 

 ARMSTRONG, F.R.S. 



VOL. LXIV. 2 F 



