170 Transmission of the Typanosoma Evansi by Horse Flies. 



hoped to have been able to make arrangements for studying both 

 diseases side by side, but have not yet been able to do so on account 

 of the disturbed state of South Africa. 



March 21, 1901. 



Sir WILLIAM HUGGINS, K.C.B, D.C.L., President, in the Chair. 



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

 ordered for them. 



The Croonian Lecture, " Studies in Visual Sensation," was delivered 

 by Professor C. Lloyd Morgan, F.E.S. 



March 28, 1901. 

 Mr. TEALL, F.G.S., Vice-President, 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 Arc Spectrum of Vanadium." By Sir N. Lockyer, 



F.E.S., and F. E. Baxandall. 



II. " On the Enhanced Lines in the Spectrum of the Chromosphere." 



By Sir N. Lockyer, F.E.S., and F. E. Baxandall. 



III. " Further Observations on ISTova Persei, No. 2." By Sir N. 



Lockyer, F.E.S. 



IV. " The Growth of Magnetism in Iron under Alternating Magnetic 



Force." By Professor Ernest "Wilson. Communicated by 

 Professor J. M. Thomson, F.E.S. 



V. "On the Electrical Conductivity of Air and Salt Vapours." By 

 Dr. H. A. Wilson. Communicated by Professor J. J. Thom- 

 son, F.E.S. 



The Society adjourned over the Easter Eecess to Thursday, May 2. 



