1907.| Influence of Increased Barometric Pressure on Man. 17 
third smaller one, were exposed to a pressure of 105 to 110 lbs. for 
51 minutes, and decompressed in four and a-half seconds. 
The biggest rabbit went into convulsions in three and a-half minutes, and 
the medium-sized one was affected shortly after. On unscrewing the 
chamber both were found dead, exhibiting the usual post-mortem appearances. 
The smallest rabbit seemed normal.* 
(c) Cats. 
Exp. 27.7.06.—A pregnant cat and half-grown kitten were exposed to 
4+ 100 Ibs. for 30 minutes, and decompressed in six seconds. The cat died 
in 20 minutes. 
Autopsy.—Veins and arteries full of bubbles and froth. Lungs emphyse- 
matous and congested in patches, owing to air embolism. 
Fotuses—Air bubbles in amniotic fluid, which frothed on pouring into 
a beaker; air in foetal lungs and liquid contents of stomachs, none visible 
in the blood. The kitten, which appeared normal, was killed for examina- 
tion within a minute of opening the chamber. No bubbles were seen. 
The bladder was full of urine, which frothed like champagne when poured 
into a beaker. 
25.1.07.—An old cat and a half-grown cat were exposed to + 110 lbs. 
for 85 minutes, and decompressed in seven seconds. The old cat was found 
to be dead on opening the chamber, the young cat survived 20 minutes. 
26.7.07.—An old cat and two kittens (half grown) exposed to + 100 lbs. 
for 30 minutes and decompressed in 10 seconds. The cat was found dead on 
opening the chamber, the two kittens survived. 
Collecting our results on rabbits and cats, we have :— 
Fable Vi 
Animals. Died. Survived. nee be Ly 
with probable errors. 
Young rabbits ......... 5 g 35°7 + 8°64 
Old rabbits <2. .0060 006 2 iE 66 67 +18 °36 
Wourg, cats:..0<9. 1.24.45. 6 6 50°0 + 9°735 
OTA CALS ica sats oaesiecoe des 6 0 100°0 + 8-0(?) 
The difference in the first group is hardly sensible (30°97 + 20:3), in the 
second, perhaps, significant (50 + 12:6). 
* Although this animal had no decompression symptoms, it died four days later from 
_ pneumonia, produced probably by the rupture of the lung tissue, which occurs in many 
cases on sudden decompression, followed by infection. 
VOL. LXXX.—B, C 
