586 O E N E R A T I O N. SECT. XXXIX. 6. 



after a time, (as about a quarter of a lunation,) ex- 

 cites the extreme veflels of the fkin into certain 

 motions, which produce a fimilar contagious mate- 

 rial, rilling with it a thoufand puftules. So that by 

 irritation, or by ienfation in confequence of irri- 

 tation, or by affociation of motions, a material is 

 formed by the extremities of certain cutaneous vef- 

 fels, exadly fimilar to the ft imulating material, which 

 caufed the irritation, or eonfequent fenfation, or 

 affociation. 



Many glands of the body have their motions, and 

 in confequence their fecreted fluids, affe&ed by 

 pleafurable or painful ideas, fince they are in many 

 instances influenced by fenfitive affociations, as well 

 as by the irritations of the particles of the palling 

 blood. Thus the idea of meat, excited in the minds 

 of hungry dogs, by their fenfe of vifion, or of 

 fmell, increafes the difcharge of faliva, both in quan- 

 tity and vifcidity ; as is feen in its hanging down in 

 threads from their mouths, as they ftand round a 

 dinner-table. The fenfations of pleafure, or of pain, 

 of peculiar kinds, excite in the fame manner a great 

 difcharge of fears ; which appear alfo to be more 

 faline at the time of their fecretion, from their in- 

 flaming the eyes and eye-lids. The palenefs from 

 fear, and the blufh of fhame, and of joy, are other 

 inftances of the effects of painful, or pleafurable 

 fenfations, on the extremities of the arterial fyftem. 



It is probable, that the pleafurable fenfation ex- 

 cited in the ftomach by food, as well as its irrita- 

 tion, contributes to excite into a6lion the gaftric 

 glands, and to produce a greater fecretion of their 

 fluids. The fame probably occurs in the fecretion 

 of bile ; that is, that the pleafurable fenfation ex- 

 cited in the ftomach, afTecls this fecretion by fenfi- 

 tive affociation, as well as by irritative affociation. 



And laftly it would feem, that all the glands in 

 the body have their fecreted fluids affected, in quan- 



tity 



