On the Arrangement of the Sympathetic Nervous System. 547 



Johnston (R. M.) Handbook of Tasmania for the year 1892. 8vo. 



Tasmania. The Tasmanian Government. 



Kops(J.) Flora Batava. Aflev. 299 300. 4to. Leiden [1892]. 



The Netherlands Government. 

 Lorentzen (G.) Ueber die Untersuchung der Seal en eines Helio- 



meters. 4to. Kiel 1892. The Author. 



Pfliiger (E.), For. Mem. R.S. Ueber die quantitative Analyse des 



Glykogens. 8vo. Bonn 1893. The Author. 



Volger (G. H. 0.) Die Lichtstrahlen. 8vo. Emden 1892. 



The Author. 

 Wilson (W. E.) and A. A. Rambaut. The Absorption of Heat in 



the Solar Atmosphere. 8vo. Dublin 1892. The Authors. 



February 9, 1893. 



Sir JOHN EVANS, K.C.B., D.C.L., LL.D., Yice-President and 

 Treasurer, 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. " Preliminary Account of the Arrangement of the Sympa- 

 thetic Nervous System, based chiefly 011 Observations 

 upon Pilo-motor Nerves." By J. N. LANGLEY, F.R.S., 

 Fellow of Trinity College, Cambridge. Received January 



21, 1893. 



[PLATE 14.] 



I propose to give here a general statement of some of the conclu- 

 sions which I have come to with regard to the arrangement of the 

 sympathetic nervous system, reserving detailed treatment for a later 

 time. As a starting point I take the distribution of the pilo-motor 

 nerves in the cat.* 



In the cat, the spinal nerves which contain pilo-motor fibres in their 

 nerve-roots, are usually the 4th thoracic to the 3rd lumbar inclusive. 

 Such fibres are, in rare cases, present in the 3rd thoracic nerve, and 

 occasionally in the 4th lumbar nerve. 



* A certain number of facts with regard to this, I have given in an earlier paper 

 written in conjunction with Dr. Sherrington. Dr. Sherrington dealt with the 

 pilo-motor nerves in the monkey (of. ' Journ. of Physiol.,' vol. 12, p. 278, 1891). 

 VOL. LII. 2 



