SUP. I. 15. i. THEORY OF FEVER. 495 



for a few weeks by the introduction of blood into a vein, once 

 in two or three days ; which might thus give further time for 

 the recovery of the torpid ftomach ? Which feems to require 

 fome weeks to acquire its former habits of action, like the muf- 

 cles of paralytic patients, who have all their habits of voluntary 

 aflbciations to form afrefh, as in infancy. 



If this experiment be again tried on the human fubject, it 

 fliould be fo contrived, that the blood in pafling from the well 

 perfon to the fick one mould not be expofed to the air ; it mould 

 not be cooled or heated ; and it mould be meafurcd ; all which 

 may be done in the following manner. Procure two filver pipes, 

 each about an inch long, in the form of funnels, wide at top, 

 with a tail beneatfc, the former fomething wider than a fwan- 

 quill, and the latter lefs than a fmall crow-quill. Fix one of 

 thefe filver funnels by its wide end to one end of the gut of a 

 chicken frefh killed about four or fix inches long, and the other 

 to the other end of the gut j then introduce the fmall end of" 

 one funnel into the vein of the arm of a well perfon downwards 

 towards the hand ; and laying the gut with the other end on a 

 water-plate heated to 98 degrees in a very warm room, let the 

 blood run through it. Then prefling the finger on the gut near 

 the arm of the well perfon, flide it along fo as to prefs out one 

 gutful into a cup, in order to afcertain the quantity by weight. 

 Then introduce the other end of the other funnel into a fimilar 

 vein in the arm of the fick perfon upwards towards the moul- 

 der ; and by fliding one finger, and then another reciprocally, 

 along the chicken's gut, fo as to comprefs it, from the arm of 

 the well perfon to the arm of the fick one, the blood may be 

 meafured, and thus the exa6l quantity known which is given 

 and received. See Clafs I. 2. 3. 25. 



XV. Inflammation excited in Fever. 



i . When the actions of any part of the fyftem of capillaries 

 are excited to a certain degree, fenfation is produced, along 

 with a greater quantity of heat, as mentioned in the fifth article 

 of this fupplement. When this increafed capillary action be- 

 comes ftili more energetic, by the combined fenforial powers of 

 fenfation with irritation, new fibres are fecreted, or new fluuis, 

 (which harden into fibres like the mucus fecreted by the iilk- 

 worm, or fpider, or pinna,) from which new veflels are con- 

 ftructed ; it is then termed inflammation : if this exifts in the 

 capillary veflels of the cellular membrane or (kin only, with fee- 

 ble puliations of ^the heart and arteries, the febris fenfmva inir- 

 ritata, or malignant fever, occurs ; if the coats of the ai 



are 



