. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 274 RESPIRATION. on the flat expansion of a cell-wall. But it is quite an error to suppose that each cellule has its own separate arterial ramusctile. Professors Harting and S. Van tier Kolk's injections place this point beyond doubt: — " quod ad divisionem ramorum arteriarum at- tinet, animadvertenduin est, non alveolum quemquesingulum ramulum accipere,quum hoc tantum valeat de infundibulis, ita ut lobulus, infundibula continens, accipiat truncuin arte- riae, ille truncus ad numerum infundibulorum dividatur et iter
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 274 RESPIRATION. on the flat expansion of a cell-wall. But it is quite an error to suppose that each cellule has its own separate arterial ramusctile. Professors Harting and S. Van tier Kolk's injections place this point beyond doubt: — " quod ad divisionem ramorum arteriarum at- tinet, animadvertenduin est, non alveolum quemquesingulum ramulum accipere,quum hoc tantum valeat de infundibulis, ita ut lobulus, infundibula continens, accipiat truncuin arte- riae, ille truncus ad numerum infundibulorum dividatur et iterum ; (Adriani). From this description it results that the ca- pillary lueb without an intervening trunk stretches from cell to cell. One more im- Fig. Injected preparation of a single arterial tieig and the attendant vein, showing a single plane of capil- laries overlying the air-cells. The pleural capil- lary system is distinguished from that of the true pulmonary tissue by the greater denseness of the vascular web and greater minuteness of the meshes in the latter situation. (After Kottiker.} portant fact remains to be stated with refer- ence to the capillary plexus. It is noivherc doubled upon itself, as it is in the lung of the reptile. Every cell-wall and every partition between the cells bears only a single layer of vessels. The opposed sides of such a layer must therefore bound two different cells, and the current of blood by which it is traversed must be subjected on both its flat sides to the action of air contained in the cells. If this plexus were double, only one side could re- ceive the influence of the atmosphere. This type is exemplified in the reptilian lung. All other things being equal the respiration of the mammal and man must be twice in amount that of the reptile. But this anato- mical fact has also an interesting pathological bearing. When the capillary layer, or rather the blood borne by it, is the seat of disease, the products
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