61. Although the lungs perform several essential operations not immediately connected with nutrition, still, as the chyle is incapable of becoming blood without their assistance, they necessarily constitute an important link in the chain of assimilative functions. It would be digressing too much from the plan of this work, to enter into anatomical details of their structure; but it may be necessary to remind the practitioner, that the lungs are supplied with a part of the nerve of the eighth pair, and some filaments of the sympathetic, which will account for the sympathies which subsist between the respiratory and digestive organs.