20$ Addition to the Croonian Lecture. 
gas was made to pass and repass into and from the lungs 
about thirty times in a minute. At first, the heart acted one 
hundred and twenty times in a minute, with regularity and 
strength ; the thermometer, in the rectum, rose to iqo°. At 
the end of an hour, the heart acted as frequently as before, 
but more feebly ; the blood in the arteries was very little more 
florid than that in the veins ; the thermometer in the rectum 
had fallen to 93 0 . The gum bottle was then removed. On 
causing a stream of the gas, which it contained, to pass through 
lime-water, the presence of carbonic acid was indicated by 
the liquid being instantly rendered turbid. The proportion of 
carbonic acid was not accurately determined ; but it appeared 
to form about one-half of the quantity of gas in the bottle. 
B. C. BRODIE. 
ERRATA. 
Page 39, line 13, for artery read ureter. 
47, last line of table 4th col. for read 91^. 
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W. BULMER & Co. 
Cleveland-Row , St. James’s 
London. 
