Class I. i. 2. 4. OF IRPJTATION. 19 



in fome parts of the Eaft, does not expend nearfy Co much Ten- 

 torial power, as when the warmth is produced by the locomo- 

 tion of the whole weight of the body by mufcular action, as in 

 walking, or running, or fwimming. Whence the warmth of a 

 fire is to be preferred to flannel fhirts for weak people, and the 

 agitation of a hone to exercife on foot. And I fuppdfe tho 

 who are unfortunately loll in mow, who are on foot, are liable 

 to perifh fooner by being exhausted by their mufcuUr exertions \ 

 and might frequently preferve themfelves by lying on the ground, 

 and covering themfelves with fnow, before they were too muck 

 exhaufted by fatigue. See Botan. Garden, Vol. H. the note ca 

 Barometz. 



M. Buflon made a curious experiment to fhew this circiirrw 

 fiance. He took a numerous brood of the butterflies ofi. 

 worms, fome hundreds of which left their eggs on the fime day 

 and hour ; thefe he divided into two parcels ; and placing one par- 

 cel in the fouth window, and the other in the north window of his 

 houfe, he ohferved, that thofe in the colder fituation lived many 

 days longer than thofe in the warmer one, Ftfom thefe obferva- 

 tions it appears, that the wearing of flannel clothing next the fikin, 

 which is now fo much. in fafbion, however uieful it mav be in 

 the winter to thole, who have cold extremities, bad digeitions, or 

 habitual coughs, mull greatly debilitate them, it worn in the warm 

 months, producing fevers, eruptions, and premature cid age. 

 See Sett. XXXVII. 5. Clafs I. 1. 2. 14. Art. III. 2. 1. 



4. Ur.'ina uberior cplorata. Copious coloured urine. To- 

 wards the end of fever-fits a large quantity of high coloured 

 urine is voided, the kidneys continuing to act ftrongly, after . 

 increa fed action of the abforbents of the bladder is fome what 

 diminifhed. If the abforbents continue aifo to act ftrongly, the 

 urine is higher coloured, and fo loaded as to depofit, when cool, 

 an earthy fediment, erroneouily thought to be the material caufe 

 or the difeafe ; but is fimnly owing to the fecretion of the kidneys 

 being great from their increafed action ; and the thinner parts 

 of it bein^ abforbed bv the increafed action of the lvmohatics, 

 which are fpread very thick on the neck of the bladder ; for the 

 urine, as well as perhaps all the other fecreted fluids, is produced 

 from the kidneys in a very dilute (late j as appears in thofe, 

 who from the ftimulus of a ftone, or other caufe, evacuate their 

 urine too frequently ; which is then pale from its not having 

 remained in the bladder long enough for the more aqueous part 

 to have been re-abforbed. The general ufe of this urinary ab- 

 forption to the animal ceconomy is evinced from the urinary blad- 

 ders of fifh, which would otherwife be unneceiTary. High col- 

 cared urine in large quantity {hews only, that the fecreting vef- 



fels 



