Sw.L I'j. i> THEORY OF FEVER. 49 j 



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

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

 the recovery of the torpid itomach ? 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 fubjcct, it 

 mould be fo contrived, that the blood in palling from the well 

 perfon to the Qck one mould not be expofed to the air ; it fhould 

 not be Cooled or heated ; and it fhould be meafured ; 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 beneath, the former fomething wider than a fwan* 

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

 thefe (ilver 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 ; 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 preffing the finger on the gut near 

 the arm of the well perfon, Aide 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 fimiiaf 

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

 der ; and by Aiding 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 exact quantity known which is given 

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



XV. Inflammation excited in Fever. 



1 . 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 ftill more energetic, by the combined fenforial powers of 

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

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

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

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

 capillary veffels of the cellular membrane or fkin only, with fee- 

 ble puliations of the heart and arteries, the febris fenfitiva ir.ir- 

 ritata, or malignant fever, occurs ; it the coats of the arteries 



