Scientific Proceedings. 



153 



The modifications of the vascular walls are produced mainly 

 by the changes of blood pressure. No great change occurs if the 

 blood pressure of the transplanted vessel be not modified. Seg- 

 ments of carotid, aorta or vena cava of one animal, transplanted in 

 the carotid, aorta or vena cava of another animal of the same size 

 and species, do not undergo any important anatomical modifica- 

 tion. If blood pressure be diminished, the wall of the transplanted 

 vessel becomes thinner. Six months after the operation, it was 

 found that the wall of the carotid transplanted in the external 

 jugular vein was thinner than the normal one. If blood pressure 

 be increased, hypertrophy of the wall ensues. A segment of ex- 

 ternal jugular vein interposed between the cut ends of the carotid 

 artery was a little dilated and its wall was as thick as the arterial 

 wall, eight months after the operation. In other cases, there was 

 no dilation of the lumen of the vessels. As a rule when a vein 

 is anastomosed uniterminally to an artery, its lumen is found to be 

 dilated, six or seven months after the operation. Nevertheless, 

 after one year the lumen may progressively diminish in size, as 

 was seen in a dog operated upon twenty two months ago. 



It may be concluded that transplanted blood vessels adapt 

 themselves to the pressure by thinning or thickening their walls. 



106 (249) 



The dependence of gastric secretion upon the internal secre- 

 tion of the salivary glands. 



By JOHN 0. HEMMETER. (Communicated by S. J. MELTZER.) 



[From the Physiological Laboratory of the University of Maryland. ~\ 



The relations of the gastric secretion to the salivary glands are 

 illustrated by the following clinical and experimental observations : 



1. In four cases of Mikulicz's disease with normal conditions 

 of the blood the stomach was found to secrete no gastric juice 

 during the course of the disease. Mikulicz's disease consists in a 

 benign chronic swelling of all the salivary and lacrimal glands. 



2. In dogs with accessory stomachs (Pawlow) the removal of all 

 the salivary glands abolishes permanently all gastric secretion. 



3. The gastric secretion is not started in such dogs by feeding 



