SUP. I. 15. 1. 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 stomach? Which seems to require some 

 weeks to acquire its former habits of action, like the muscles of 

 paralytic patients, who have all their habits of voluntary associa- 

 tions to form afresh, as in infancy. 



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

 should be so contrived, that the blood in passing from the well 

 person to the sick one should not be exposed to the air; it should 

 not be cooled or heated; and it should be measured; all which 

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

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

 wiih a tail beneath, the former something wider than a swan- 

 quill, and the latter less than a small crow-quill. Fix one of 

 these silver funnels by its wide end to one end of the gut of a 

 chicken fresh killed about four or six inches long, and the other 

 to the other end of the gut; then introduce the small end of one 

 funnel into the vein of the arm of a well person downwards to- 

 wards 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 pressing the finger on the gut near 

 the arm of the well person, slide it along so as to press out one 

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

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

 vein in the arm of the sick person upwards towards the shoul- 

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

 along the chicken's gut, so as to compress it, from the arm of 

 the well person to the arm of the sick one, the blood may be 

 measured, and thus the exact quantity known which is given 

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



XV. Inflammation excited in Fever. 



1. When the actions of any part of the system of capillaries 

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

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

 of this supplement. When* this increased capillary action be- 

 comes still more energetic, by the combined sensorial powers of 

 sensation with irritation, new fibres are secreted, or new fluids, 

 (which harden into fibres like the mucus secreted by the silk- 

 worm, or spider, or pinna,) from which new vessels are con- 

 structed; it is then termed inflammation: if this exists in the ca- 

 pillary vessels of the cellular membrane or skin only, with feeble 

 pulsations of the heart and arteries, the febris sensitiva inirri- 

 tata, or malignant fever, occurs; if the coats of the arteries 



