FORMATION OF BLOOD. 
The tieking of blood appears: to be nothing more than the nig 
by the action of the blood vessels, of the chyle with the blood ; for 
as it passes from the chest vein, it ‘changes its color, and when it has 
_ reached the heart, cannot be distinguished from the mass of circulat- 
ing blood. 
Nerves’ axe long: wisietr-tofts, ompose "of fibre 
which serve for sensation. ‘Their origin is in the a te hindel 
brain, oblong marrow and spinal marrow; and their termination | ‘is, 
in the organs of sense, the viscera, vessels, muscles, bones, &c. They 
are divided into trunks, branches, little branches, nervous ae and 
knots, In substance they are pulpy. Division, into b 
nal, Number, thirty-nine pair ; nine pair of brain § ne é hil 
pair of spinal. ae Se 
The nine pair of brain nerves, are: 1. The aca 2 The = 
optic. 3. The mover of theeye. 4. ieteaicpens 5. The triple- 
twin. 6. The abducent. 7. The ear and 
sympathetic nerves. 9. The tongue pair. The thir 
neead are divided into eight pair of neck, pear aror A of back, 
pair of loin, and five pair ofsacred nerves. Their use is, for: 
tion in’ the sensible parts, for the five external senses, as touch, 
sight, hearing, smelling and taste; and for the motion of the mus- 
NERVES OF THE BRAIN. | 
_ The first pair, or smelling nerves, arise from the hollowed bodi 
‘pass forwards over the wedge and forehead bones, one to 
of the pituitary cavity, where they send off a of | 
which go through the sieve-holes of the 
on the pituitary or mucus membrane < : 
The secon second pair, or optic : nerves, rise from the bed of the optic 
nerve, ihe Dilioge other, then pass through the optic holes and per- 
forate the bulb of the pein it form the rewmit, which i is the or 
gan of vision. 
