76 Mr. A. B. Baaset. Reflection and Refraction [Jan. - s . 



January 8, 1891. 

 Lieut -General STRACHEY, R.E., Vice-President, in the Chair. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : 



I. " On the Minute Structure of the Muscle-columns or Sarco- 

 styles which form the Wing Muscles of Insects. Pre- 

 liminary Note." By E. A. SCHAFER, F.R.S. Received 

 December 15, 1890. 



[Publication deferred.] 



II. " On the Minute Structure of Striped Muscle, with Special 

 Reference to a New Method of Investigation, by means of 

 ' Impressions ' stamped in Collodion." By JOHN* BERRY 

 HAYORAFT. M.D., D.Sc., F.R.S.E. Communicated by Dr. 

 KLEIN, F.R.S. (From the Physiological Laboratory, Univ. 

 Edin.) Received January 2, 1891. 



[Publication deferred.] 



III. " On the Reflection and Refraction of Light at the Surface 

 of a Magnetised Medium." By A. B. BASSET, M.A., F.R.S. 

 Received December 17, 1890. 



(Abstract.) 



The object of the present paper is to endeavour to ascertain how 

 far the electromagnetic theory of light, as at present developed, is 

 capable of giving a theoretical explanation of Dr. Kerr's experiments* 

 on the effect of magnetism on light. 



In the first series of experiments, polarised light was reflected from 

 the polished pole of an electromagnet, so that the lines of magnetic 

 force were perpendicular to the reflecting surface ; and in the second 



* ' Phil. Mag.,' May, 1877, and March, 1878. 



