692 
DR. E. SMITH OH THE CHE^IICAE 
A. Carbonic Acid evolved. 
The carbonic acid during eighteen hours, or the period constituting the working day, 
was as follows in oz. avoirdupois (28-332 grms.), in the order of the inquiries as above 
mentioned. 
Continuous inquiries. 
A . 
March. 
^lay. 
March. 
oz. grms. 
oz. grms. 
oz. grms. 
21-6 (611-97 ) 
24-4 (691-3 ) 
24-328 (689-28) 
21-205 (600-78 ) 
19-33 (547-65) 
19-582 (564-797) 
16-43 (465-49) 
August, 
oz. grms. 
Myself . 
Mr. Moul . 
Dr. Murie . . 
Prof. Franklaiid 
The average results were, -myself, 24-27i oz. (687-7 grms.) (9-77 grs. per minute), 
a quantity identical with the results of two out of the four inquiries, and Ur. UoVL. 
20- 267 oz. (574-11 grms.); whilst the total average of the eight sets of inquines was 
21- 693 oz. (614-6 grms.), or 8-78 grs. per minute. This contains a total quantity ot 
5-917 oz. (167-64 g-rms.) of carbon. 
The quantity evolved during the remaining- six hours of the day was determuiec ) 
two inquiries upon myself alone. 
On July 15, whilst scarcely awake, at 1|, 2^, and 6^ a.m., I exhaled o-i, o-94, ant 
6-1 o-rs. per minute, on the average of one-quarter of an hour at each of those hour’s. On 
July 16 during light sleep, at 1 and 3 A.M., the quantities were 4-88 grs. and 4-99 grs. per 
minute on the same average (Table VIII. July 16). As the latter quantities are notably 
less than the former, and yet the difference in the state of the system was not great, I thmk 
it probable that in profound sleep the quantity would be still less, and probably so low 
as 41- grs. per minute. The duration of profound sleep is, however, short ; tor in a series 
of hourly inquiries into the rate of pulsation and respiration, both in health and disease 
published in the Transactions of the Eoyal Medical and Chii-ui-gical Socmty for ISob 1 
showed that the lowest rate of the respiration was from 1 to o a.m. ; and in apphuiig t le 
above calculation of the influence of profound sleep I limit its occurrence to those two 
hours. In estimating the state of the respiration in the hour preceding, and also in 
the hours succeeding, until the hour when my inquiries in the working day commenced 
1 take the average between the state in profound sleep and at those preceding and 
succeeding hours. From these data the result is obtained of 1950 grs. of carbonic acid 
evolved during those six hours ; and this, added to the total average of the working day. 
oives a total for the twenty-four hours in a state of rest of 26-193 oz. ot carbonic acid. 
or 7-144 oz. of carbon. 
The same addition being made to the results obtained troiii each peisoii, tie qiian 
tities of carbon exhaled in twenty-four hours, in a state of rest, are as tollows in ounces 
avoirdupois 
