( 225 ) 



The strengths of field used in all other exposures, could be deter- 

 mined by comparison of' corresponding iron lines in the spectrum 

 under review and in the standard iron-zinc spectrum. 



The field strengths utilised were near 30000 Gauss. In the following 

 table all separations are reduced to H= 31965 Gauss. 



A calcite rhomb introduced between the spark and the focussing 

 lens made it easy to get separate exposures of vibrations perpendicular 

 to resp. parallel to the field. The plates used were Dr. Schleussner's 

 Spezial Rapid plates. They were developed with Edinol. 



In the following table éX and X are given in A.U. The wavelengths 

 and intensities are taken from Exner and Haschek's tables. 



In the case of triplets and quartets 6). indicates the difference of 

 the wavelengths of the two outer components vibrating perpendicular 

 or parallel to the lines of force. In the case of quintets for vibrations 

 perpendicular to the lines of force the difference of wavelengths of 

 the components towards red and violet to the central one are given. 

 For vibrations parallel to the lines of force the data are given as in 

 the case of triplets. 



Probably some triplets can be subdivided further, but even an 

 approximate knowledge of the magnetic separation of the iron lines 

 has become recently of some value by Hale's important discovery 

 concerning the spectrum of sun-spots 1 ). 



I hope to give in my thesis references to the literature of the 

 subject. 



Anatomy. — " The nervous system of a white cat, deaf from its 

 birth: A contribution to the knowledge of the secondary systems 

 of the auditory nerve-fibres". By Prof. C. Winkler. 



Through the kindness of Prof. Zwaardemaker, speaker got in his 

 possession the nervous system of a white blue-eyed cat, which during 

 life, though most carefully observed, never reacted on acoustic stimuli, 

 consequently deaf from its birth 2 ). 



This nervous system had been slightly damaged in the removing, 



1 ) George E. Hale. Solar Vortices and the ZEEMAN-Effect. 



P. Zeeman. Solar Magnetic Fields and Spectrum Analysis. Nature. Vol. 78, 

 p. 368 and 369, 1908. 



~) Prof. Zwaardemaker writes on this subject the following: 

 "This white catt, born of a white mother with normal hearing (one albino-eye) 

 "was obviously deaf from its birth. At any rate it was kept under observation 

 "since birth, and never a single reaction on acoustic stimuli was obtained. Even 



