VOL. VIII.] PHILOSOPHICAL TRANSACTIONS. 75 



sensitive soul, at least to the functions of sense ; the other from the Cerebrum, 

 subservient to the involuntary motions, and of which we are not conscious or 

 sensible, and which belong rather to the functions of the vegetative soul, 

 (nutrition, &c.) or at least the insensible loco-motive faculty: and to these latter 

 seem reducible those acts of sense, which Mr. Lister speaks of in plants. See 

 Dr. Willis de Cerebro, c. ig, p. 241, edit, in 4to, and c. 15, p. 187. 



On the IfTiiteness of the Chyle within the lacteal Feins ; with divers particulars 

 observed in tlie Guts, especially several Sorts of JVorms found in them. By 

 Mr. Lister. N' 95, p. 6060. 



I have long wished to discover the actual passage of the chyle into the 

 lacteal veins ; of which yet I never doubted, as I find some do at this day. 

 The difficulty lies in the certain and unalterable character of the chyle's white- 

 ness, especially when received into those veins. And yet it is as certain, that 

 in a diabetes the urine retains all the qualities of the liquor drunk. Also in that 

 famous instance of those that eat the fruit called the prickle-pear, their urine 

 has aifrighted the eater with the colour of blood, that is, with the unaltered 

 colour of the juice of the fruit. In these instances at least we cannot doubt but 

 the chyle, even in the lacteal veins, was qualified according to the food and 

 drink. 



To effect then something to this purpose, we have formerly, and that very 

 often, repeated the experiment of injecting highly tinged liquors into the guts 

 of a live animal. Thus, having laced the skin of the abdomen of a dog loosely 

 for a hand's breadth, and then opening it underneath the stitches, we took out 

 either the duodenum, or any other part of the tenuia intestina. The gut taken 

 out, we opened with a very small orifice, and having ready the tinged liquor 

 lukewarm, we injected it upward and downward: carefully stitching up the gut, 

 and then drawing the lace, we unloosed two of the dogs feet, laying hjm on 

 his side for what time we thought convenient. The tinged liquors we used, 

 were good Barbadoes indigo, in fair water, and filtrated; also lumps of indigo 

 thrust down his throat ; good broth, as they call it, of a blue vat ; indigo in 

 milk, saffron in milk. Again, we tried in some dogs fed before hand, and in- 

 jected the liquors in the very height of the chyle's distribution ; into others yet 

 fasting, and that for a longer or shorter time. 



The success was so constant, that we cannot say we ever found the least dis- 

 colouring of the chyle on the other side the guts, that is, within the lacteal 

 veins, but ever white and uniform. Whence we judge it not very feasible to 

 tinge the venal chyle in a well and sound animal. And he that would demon- 



La 



