4. The sharp P. _Soe_, producing the sensation of a cutting or sawing
instrument.
5. The slow P. _Tehis_, when the pulsations follow each other with languid
intervals.
6. The sinking P. _Fou_, when the pulse, although pressed hard, sinks
under the finger.
7. The soft P. _Sin_, which feels like a drop of water one might press
upon.
8. The weak P. _Yo_, which yields the sensation of feeling like a worn-out
texture, and ceases to be observed when pressed upon for any time.
To these are added nine other varieties, called _Tao_.