The Relation of Thalamus to Respiration. 165 



media, with the exception of the place near the suture line. Here 

 there was noticeable a hyperplasia of the intima, which was ap- 

 parently due to the irritation caused by the silk suture acting as a 

 foreign body. 



The most important abnormity found in nearly every vessel 

 examined was a new fibrous tissue formation in the adventitia, and 

 this adventitial connective tissue formation was apparently the 

 only cause for the thickening of the wall of the vein on gross 

 inspection. 



On the other hand, it is interesting to note that an obliterative 

 endarteritis was found in two experiments where infection took 

 place after the operation. 



The conclusion must be drawn, as a result of the investigation, 

 that an arterial lesion cannot be induced artifically on a previously 

 healthy blood vessel of a dog by mechanical change within the 

 vessel. 



106 (516) 



The relation of the thalamus to respiration, blood pressure 

 and blood supply of the spleen. 



By E. SACHS. (By invitation.) 



[From the Laboratory of Physiological Chemistry of Cornell 

 University, New York.] 



In the past year I have been carrying on, in Dr. Wolf's labora- 

 tory at Cornell, some experiments on the optic thalamus in cats 

 with Clarke's stereotaxic instrument. In some work on the an- 

 atomy and physiology of this region, published in Brain about a 

 year ago, I showed that the thalamus could be anatomically di- 

 vided into a median and lateral portion. The lateral was con- 

 nected with the pre- and post-central gyri, or what corresponds to 

 this area in the carnivora, while the median portion composed of 

 the anterior and median nuclei was intimately connected with 

 the nucleus caudatus and rhinencephalon. 



In my present work the relation of the thalamus to blood 

 pressure, respiration and changes in spleen volume was studied. 

 Bechterev and his pupils, Christiani and Ott, have found variations 

 in these functions, and the former has claimed that special centers 

 exist in the thalamus for these functions. 



