22 Effect of the Spectrum on Haloid Salts of Silver. [Dec. 12, 



The anatomy of the part and the relation of the fibres to the basal 

 ganglia are then discussed, and a full description given of each of the 

 groups examined. 



The general results are next given at length, of which the following 

 is a resume. 



Firstly, the rare occurrence of bilateral movement is discussed, 

 and the meaning of the phenomenon defined. Secondly, the lateral 

 arrangement and juxtaposition of the fibres are considered. Thirdly, 

 the antero-posterior order in which the fibres for the movements of 

 the different segments are placed is described, and that order found 

 to be practically identical with that observed on the cortex, viz., from 

 before back. 



eyes, 

 head, 

 tougue. 

 mouth, 



upper limb (shoulder preceding thumb), 

 trunk. 



lower limb (hip preceding toes). 



The character or nature of these movements is set out in a table 

 giving the average localisation of each segment. Speaking generally, 

 it may be said that the movements are arranged in the same way as 

 has already been shown by the authors to exist in the cortex (vide 

 previous papers in ' Phil. Trans.,' 1887, 1888), viz., that the repre- 

 sentation of extension is situated in front of that of flexion for the 

 segments of the upper limb, while for the toes flexion is obtained, as 

 in the cortex, in front of extension. 



Numerous tables and diagrams are appended, showing the extent 

 of appropriation of fibres for each movement. 



Movements of 



JJ 

 J5 



III. " On the Effect of the Spectrum on the Haloid Salts of 

 Silver." By Captain W. DE W. Abney, C.B., R.E., D.C.L., 

 F.R.S., and G. S. Edwards, C.E. Received November 26. 

 1889. 



[Publication deferred.] 



