1889.] Presents. 377 



Conclusions. 



The pulmonary vessels of the dog are supplied with vaso-motor fibres 

 leading the cord through the roots of the uppermost dorsal nerves. 

 ^To efferent vaso-motor fibres have been detected in the vagus nerve. 



The pulmonary circulation is comparatively independent of the 

 systemic, and alterations in the blood-pressui^e of the latter must be of 

 large amount to affect the pulmonary blood-pressure. It is probable 

 that no rise of aortic pressure can materially influence the pulmonary 

 blood-pressure, unless it is so great in amount or duration that the 

 heart muscle and valves are unable to cope with it, and so an actual 

 regurgitation is produced. 



It is possible that the pulmonary blood-pressure can also be affected 

 by rises of systemic pressure causing venous distension, and hence an 

 increased supply to the right side of the heart. 



Finally, although it is undoubted from the results of this research 

 that the mammalian pulmonary vessels receive vaso-motor nerves, yet 

 it is probable that the vaso-motor mechanism is but poorly developed 

 'as compared with that regulating the systemic arteries. 



In this respect it may be that the pulmonary system holds an inter- 

 mediate position between the systemic arteries on the one hand and 

 the veins on the other. 



This question we hope to elucidate by a further research. We also 

 hope that, shortly, we shall be able to give the results of our researches 

 on the vaso-dilator nerves of the lungs. 



Presents, February 21, 1889. 

 Transactions. 



Adelaide : Royal Society of South Australia. Transactions and 

 Proceedings. Vol. X (1886-7). 8vo. Adelaide 1888. 



The Society. 



Albany: New York State Museum of Natural History. Bulletin. 

 Nos. 4-6. 8vo. Albany 1888; Report, 1887. 8vo. Albany 1888. 



The Museum. 



Baltimore : Johns Hopkins University. Circulars [Various 

 numbers to meet deficiencies]. 4to. 1879-88 ; Studies (His- 

 torical and Political Science). Seventh Series. Nos. 1-3. 

 8vo. Baltimore 1889. The University. 



Belgrade : Royal Servian Academy. Bulletin. Nos. 1-9. 8vo. 

 Beograd 1888 ; Annual. 1887. 8vo. Beograd 1888 ; Obituary 

 of J. Pancie. 8vo. Beograd ] 888. [In the Servian language.] 



The Academy. 

 Bergen : Museum. Aarsberetning. 1887. 8vo. Bergen 1888. 



The Museum. 



