Lung Air Cells.  — Each air cell varies in size from the seventieth to the one two-hundredth parts of an inch in diameter.  The number of aerosols in the two lungs is truly surprising, they’re been certainly not less than 600,000,000, though according to Dr. Addison’s computation there are 1,700,000,000, equivalent to 1,500 square feet of surface on which the process of purifying the blood is constantly in continuously going on in a healthy lung.

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The book doesn’t mention who Dr. Addison is or how he reached his computation, a hundred years later these numbers seem highly questionable if for no other reason than they are not supported, there’s no footnote in the book, there’s no mention of who Dr. Addison is or what he’s done or why his numbers should be considered.  There’s no mention of who came up with the original numbers that Dr. Addison’s numbers seem to refute.

Also I’ve referenced the diagrams from chart 2, this includes three images of the lungs diagrammed and you can compare those to modern-day diagrams of the lungs from a Google image search.