60 Dr Davy's Voyage from England to Barbadoes, 



"whicli consists chiefly of phosphate of lime. Admitting the 

 fact, and I do not think I could have been mistaken, having on 

 shore been in the habit of removing the tartar from the inner 

 surface of my lower front teeth, from its collecting rapidly, — 

 the mass of phosphates in the urine might be connected with, 

 and occasion a diminution of them in the salivary secretion. 



3. Of the effect of increased Atmospheric Temperature on the 

 Temperature of Man. 



In a voyage to Ceylon, already alluded to, which I made in 

 1816, a pretty extensive series of observations there constituted, 

 tended to prove, that the temperature of man, as determined 

 by a thermometer placed under the tongue, is not a constant 

 one even in health, and that it is elevated by one or two de- 

 grees, by passing from temperate into tropical regions. Pro- 

 vided now with a more deticate thermometer than I then used, 

 I took advantage of a rapid transition from a comparatively cool 

 to a warm climate to repeat the observations. This was done 

 oh the 2d of July, when the temperature of the air between 

 two o'clock in the afternoon and half-past two, under the awn- 

 ing on deck, was about 78°. The subjects of the observations 

 were a certain number of the passengers, then apparently in 

 good health, who were sitting at the time, and who, after 

 luncheon at noon, had taken little or no exercise. 



Temp, under Temp, of vn^»t> ^^^ 

 tongue. closed hand. ^"^^c. ^bout 



1. 99'4 97' 1 86 30 A German, of large and robust frame. 



2. 99*2 ... 106 18 A Creole, rather tall and slender, re- 



turning to the West Indies, after hav- 

 ing been several years in England. 



3. 100-2 98-5 82 22 Tall and robust, also a Creole, return- 



ing, after having been educated in 

 England. 



4. 99-8 96 60 52 Stout ; returning to the West Indies, 



where, for many years he had re- 

 sided. 

 6. 99-4 98 72 22 An under graduate of Cambridge, well 



made and vigorous, visiting the West 

 Indies for his amusement during the 

 long vacation. 



6. 99. 98'2 78 24 Rather stout; never before in a hot 



climate ; a native of Ireland. 



7. 99.2 ... 78 24 Rather short and stout. 



8. 99'8 ... 76 18 A young lady, a Creole,- well made, of 



rather large frame, returning to the 

 West Indies, after having been se- 

 ' veral months in England. 



