. Aero-therapeutics; or, The treatment of lung diseases by climate; being the Lumleian lectures for 1893 delivered before the Royal college of physicians, with an address on the high altitudes of Colorado. eumonia,Pleurisy and Asthma—In what Diseases Contra-indicated —Comparison of Climate results—High Altitudes—Sea Voyages—Riviera and Home Climates—Local and General Results —Importance of Medical Supervision of Climate Patients. It is well known that at sea level barometric pressureis about 30 in., varying from a minimum of 27 in. toa maximum of 31 in. ; that it increases on descendinginto mi
. Aero-therapeutics; or, The treatment of lung diseases by climate; being the Lumleian lectures for 1893 delivered before the Royal college of physicians, with an address on the high altitudes of Colorado. eumonia,Pleurisy and Asthma—In what Diseases Contra-indicated —Comparison of Climate results—High Altitudes—Sea Voyages—Riviera and Home Climates—Local and General Results —Importance of Medical Supervision of Climate Patients. It is well known that at sea level barometric pressureis about 30 in., varying from a minimum of 27 in. toa maximum of 31 in. ; that it increases on descendinginto mines, and that, if we could have a shaft sunkvertically forty-five miles into the earth, the air at thebottom would be as dense as quicksilver, while at thesummit of the highest mountain of the Himalayas itwould be rarefied to the extent of two-thirds. Butwhat we have to deal with is the influence of lowerdegrees of density or of rarefaction on the humanbody. 92 AERO-THERAPEUTICS INCREASE OF PRESSURE Taking the subject of increase of pressure first,we find our knowledge has been chiefly derived fromthe experiments of diving bells, pneumatic tubes, orcaissons, and the effects on DIAGRAM 6.—AIR LOCK OF FORTH BRIDGE ; VERTICAL SECTION. The symptoms on descending in diving bellsdepend on the depth of water to be traversed, as, ofcourse, the compression of air increases with the depth;but at about 30 ft. deep, pain and noises in the ears arefelt, with a sensation of the head being bound with SYMPTOMS OF INCREASED PRESSURE 93 iron. According to Colladon, these cease on thebottom being reached, and the ascent is not disagree-able, except for a feeling as if the bones of the skullwere separating. No change in pulse or respirationis noted, and the above-mentioned symptoms seem dueto the rapid descent rather than to the compression ofair. Owing to there being no ventilation of these DIAGRAM 7.—AIR LOCK OF FORTH BRIDGE ; TRANSVERSE SECTION. bells, they were soon
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