Archive image from page 358 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 RESPIRATION. 283 attention is invited. The conclusions here- after to be drawn will be found opposed to Fig. 232. A small portion of the hmg of the Neivt laid open and examined by transmitted light, under a high power, such that only the surface (internal or mucous) is in focus. (Original.) a, a leading branch of the pulmonary artery, giving off at very regular intervals which' break at once into the true capillaries c, c, c.; d, d, d, denote the parenchym
Archive image from page 358 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 RESPIRATION. 283 attention is invited. The conclusions here- after to be drawn will be found opposed to Fig. 232. A small portion of the hmg of the Neivt laid open and examined by transmitted light, under a high power, such that only the surface (internal or mucous) is in focus. (Original.) a, a leading branch of the pulmonary artery, giving off at very regular intervals which' break at once into the true capillaries c, c, c.; d, d, d, denote the parenchymous islets which fill up the meshes of the capillary plexuses. (They are the true pul- monary parenchyma.') g. marks the abrupt line which abruptly limits the distribution of the ciliated epi- thelium, which follows the larger vessels in tracts; d, c, c, c, coinciding with the true respiratory or capillary areas of the lung, are seen to be destitute of ciliated epithelium. the views of Mr. Rainey. This excellent observer has affirmed the principle that, on the true breathing portions, or capillary seg- ments of the lungs, there literally exists no epithelial lining of any description whatever, the vessels being as literally naked. To this ' principle,' deliberately enunciated and sup- ported by elaborate 'proof' by an acute and truthful observer,many anatomists have yielded implicit assent. First, it is here objected that such a 'principle' violates directly all the lessons of analogy. Analogy Is not demon- stration better than analogy ? In the science of organised beings, the connected reasoning founded on analogy cannot be despised. The closest scrutiny in individual instances may miss the truth. The manifold illusions of the microscope may readily mislead. Analogy supposes a mass of cumulative evidence. The general law neutralises particular errors. In no instance whatever, either in the vertebrate or invertebrate kingdom, has it been proved, in the course of the present
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