APPENDIX. 549 



sides of the thorax, pass in between the ribs near 

 their articulation, and also behind the liganientoiu 



attachment ot'thc ribs, and anastomose with each 

 other. The medulla spinulis is surrounded with a 

 net-work of arteries in the same inamu 

 especially where it comes out from the I 

 a thick substance is formed by their rainilie.iii<>n> 

 and convolutions ; and these vessels must proba- 

 bly anastomoM- with those of the thoi 



The subclaviaii artery in the Piked \\lulc, be- 

 fore it passes over the fust rib, tt HH into 



the chest arteries which m tunning the 



plexus on the inside of the ribs; I am not certain 

 but the internal mammary arteries contribute to 

 form the anterior part of this plexus. The mo- 

 tion of the blood in such must be very slow ; the 

 use of which we do not readily see. The descend- 

 ing aorta sends off the intercostals, \> hich arc very 

 large, and give branches to this plexus; and when 

 it has reached the abdomen, it sends off, a.> in the 

 quadruped, the different branches to the vis. 

 and the lumbar arteries, which are likewise - 

 large, for the supply of that va.st mass of uiu> 

 which moves the tail. 



In our examination of particular parts, tlie size 

 of which is Hem-rally regulated by that of the 

 whole animal, if we have been accustomed to see 

 them in those which are small or middle-sized, we 

 behold them with astonishment in animals so far 

 exceeding the common bulk as the \\lule. Thus the 

 heart and aorta of the Spermaceti Wnalc appeared 

 prodigious, being too large to be contained in a 



v. ii. P. ii. 36 



