. The first [-fifth] reader of the school and family series. But there is another set of nerves running to the handbesides the nerves of motion. What if the fore-finger hadbeen directed, in the dark, to touch a certain key of the pia-no, and had chanced to ])ress upon the sharp point of a nee-dle or the blade of a knife! How could the mind be inform-ed of the danger^ ? Not by the nerves of ^notion, for theironly ofiice is to convey commands outward from the set of nerves is needed, and such has been jDrovidedin the nerves of feeling. As soon as the finger presses uponthe
. The first [-fifth] reader of the school and family series. But there is another set of nerves running to the handbesides the nerves of motion. What if the fore-finger hadbeen directed, in the dark, to touch a certain key of the pia-no, and had chanced to ])ress upon the sharp point of a nee-dle or the blade of a knife! How could the mind be inform-ed of the danger^ ? Not by the nerves of ^notion, for theironly ofiice is to convey commands outward from the set of nerves is needed, and such has been jDrovidedin the nerves of feeling. As soon as the finger presses uponthe needles point, some of these numerous and minute nervesof feeling are pierced, and instantaneously they convey the in-telligence to the brain. As quick as thought, a command isthen sent down, through the nerves of motion, to withdrawthe finger, if possible, before any serious injury is the bundle of nerves of feeling running to the hand shouldbe severed, the finger might be pierced through, or cut oflF, Fig. 4. EXTERNAL SIDE VIEW OP THE Fig. 4 represents an externalside view of the right half of thebrain. At 1 is seen the medullaoblongata, or beginning of thespinal marrow : at 3, a side viewof the cerebellum, ov little chief office of the cerebellumis believed to be that of combining,regulating, and diiecting all themuscular movements. Irom ex-periments on animal, it is foundthat when it is cut it gives riseto neither motion nor sensation,but when it is removed in slicesthe animal gradually loses allpower of rernditina its weight of the cerebellum isabout one ei;;hth of that of thecerebnim. The average weightof the entire brain in man is aboutfifty ounces; in females about for-ty-five. 2d DiV. OF . . HUMAN PHYSIOLOGY AND HEALTH. 91 and the mind have no knowledge of it! And why^ ? Becauseno notice of the injury could be sent from the finger up to thebrain. 8. The following fact illustrates the xise of the nerves offeeling in preventing
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