In order to detect the properties of PSc

in Meng Cheng county

the authors have made a longe term and periodic observation on 54 cases in channel sensitive persons. Among 39 cases

PSc of relative stability was: in one month 37 cases (94.9%)

after a year 29 cases (74.3%)

after 3 years 25 cases (64.1%). PSM disappeared or partly disappeared: in a month 2 cases (5.1%)

after a year 10 casss (25.7%)

after 3 years 14 cases (35.9%). Amo- ng 15 cases

after 5 years

PSc Was relatively stable in 6 cases

absent or partly absent in 9 cases. PSc disappeared year by year and its difference was significant (P<0.05). In 10 cases the PSc disappeared and could not be exci- ted with heat

acupuncture

low frequency impulses. Furthermore

PSc be- came relatively stable in overlaping

symmetry and coincidence with channel On the body surface of PSc sensitive persons

whose PSc partly disa- ppeared

the region of appearance and disappearance of PSc could be di- stinguished. Most of the dis-trition lines of PSc coincided with the cutane- ous segments. All these seem to show that PSc has certain substantial fou- ndation in the peripery. On the other hand

due to the semilateral distribu- tion of PSM on the body surface

its centrifugal disintegration and the independence of the nature of stimuli (pressing

needling or electric impulses) in the exci tation of PSC which may be felt by the one under observa- tion

the relationship between PSCand thalamo-cerebral cortex must be con sidered.