89
Dr. digon.
Dr. Ciigon is now in the I Medical Clinic and is not doing so
much scientific work as formerly. I investigated carefully some
of the researches he published a short time ago. he uses Muller
valves with two large Woulff bottles of about 2 liters each. These
are filled about two thirds full with water, a glass tube as large as
would go through the tubulatures just dipping under the water. He
considered them very satisfactory.
I expected to find an elaborate system for diluting expired air
to make it about one per cent carbon dioxide. Instead of that I
found that he simply expires the air into a spirometer, and after
fifty liters of expired air has collected, he pumps in 100 or more
liters of external air, and analyzes on this basis. He does not mix
it at all and thinks an ordinary diffusion sufficient. He uses a
mouthpiece and, like Loewy, has a band to tie it to the face; he be¬
lieves that all leaks are thus prevented, and the best results obtained.
He makes all of his experiments with the subject asleep, if possible,
usually in the evening after fasting all day, and considers the sleep¬
ing condition more favorable for such measurements. His analyses are
made on a very imperfect Pettersson gas-analysis apparatus. I was
much impressed by his carelessness in ordering a burette for this
apparatus. He attempted to secure a burette that would allow him to
measure at the same time both the carbon-dioxide increment and oxygen
deficit in expired air, and had therefore planned to get from 0 to
5 per cent of carbon dioxide, but had provided for a measurement of
the oxygen only between 19.5 per cent and 21.0 per cent, in other words
1.5 per cent instead of 4 or 5 per cent. This would imply a lack of
i