AND OTHEE PHENOMENA OE EESPIEATION. 
703 
The geneial expiession of the results obtained, by me is, that the advancing hot 
season lessened all the vital and mechanical changes of respiration, viz. the quantity of 
carbonic acid expired and of air inspired, the rate and depth of respiration, the quantity 
of \apom exhaled, and the cooling of the body. These include lessened muscular and 
vesicular actions and chemical changes. With the return of the cold season the quan- 
tities incieased. All the results are delineated in Plate XXXIV,, which shows the 
quantity of aii inspired and of carbonic acid expired, with the rate of respiration and 
pulsation contrasted with the temperature dui'uig each month of the year. 
The results obtained from myself correspond in all essential particulars with those 
obtained fi-om Mr. Moul, except that the changes were induced in him more quickly 
and powerfully. Hence I infer that he was more susceptible to seasonal influences; 
and this was in conformity with a law which I evolved in former researches at the 
Hospital for Consumption, and published in the British and Foreign Medical and 
Chirurgical Eeview, April 1856, viz. that all who bear heat badly have an excess of all 
the seasonal effects, for he suifers much from heat, whilst I bear it well. I was thus 
fortunate in hawng an example of the two classes of persons. I will first describe my 
returns, and then those of Mr. Moul. 
On the average of the second week in April I inspired 550 cubic inches of air per 
minute in sixteen inspirations, and expired 8'65 grs. of carbonic acid per minute ; but 
on the average of a whole month, Eom the middle of July to the middle of August, 
the quantity of ah’ was reduced to 386'4 cubic inches, of carbonic acid to 7‘27 grs., and 
late of respiration to 11 per minute. Hence there was a diminution of 30 per cent, 
in the quantity of ah’, 32 per cent, in the rate of respiration, and 17 per cent, in the 
quantity of carbonic acid ; so that the proportion of the carbonic acid to the inspired air 
n^as greater, although the total amount was lessened. Up to the end of May the quan- 
till of carbonic acid did not fall below 8 grs. per minute, and on many occasions it 
exceeded 9 grs. ; but as J une advanced the quantity progressively fell, so that it was 
often under 8 grs., but never above 8 gi’s. per mmute ; and after the 22nd of June, until 
the middle of A.ugust, the quantity was between 7 and 8 grs. Hence the beginning 
of June was the true period of commencement of seasonal decline in the respiratory 
changes. The period of the commencement of increase was October, and the increase 
continued in the succeeding months. 
The relation of the carbonic acid expired to the air inspired varied each month as 
follows, fi’om April to October inclusive : — 
^^7- Jiuie. July. August. Sept. Oct. 
Igr. to 58 cub. in. 507 cub. iu. 52 cub. in. 51-5 cub. in. 54-8 cub. in. 56-3 cub. in. 51-4 cub. in. 
In the first week of April Mr. Moul inspired 477 cubic inches of air per minute, at a 
rate of respiration of 16-4 per minute, and with an evolution of 8-28 grs. of carbonic 
acid per minute ; but by the fourth week of that month he had lost more than 20 per 
cent, of air, 18 per cent, of carbonic acid, and 13 per cent, in the rate of respiration. 
Thus the proportion of carbonic acid to the air inspired was scarcely changed. After 
that period the quantities increased from the 8th to the 18th of May; but on the averag 
