DOGWOOD. 79 
oak gall has had the experience of ages in favour 
of its permanence and immutability. It is not 
until some indigenous article, producing an equal 
intensity of colour, has undergone a series of tri- 
als from time and exposure, sufficient to establish 
beyond a doubt its durability, that its substitution 
in the manufacture of ink should be considered 
expedient or even justifiable. | | 
Upon the human boily the bark of the Cornus 
florida acts as a tonic, an astringent and an anti- 
septic, approaching in'its general effects to the 
-character of the Peruvian bark. From a variety 
of experiments made by Dr. Walker upon the 
healthy system, it was found that this medicine 
uniformly increased ‘the force and frequency of 
the pulse, and augmented the heat of the body. 
Collateral experiments were made at the same 
time with the Peruvian bark, with which the Cor- 
nus appeared to agree sgansed in its rae: and’ ex- 
ternal effects. meine Sw a 
In disease it has been a qettnigane employed in 
the same euses for which the cinchona is resorted 
to, particularly intermittent: and remittent fever. 
Dr. Gregg of Pennsylvania, cited by Dr. Walker, 
states, that after employing the Cornus florida ha- 
bitually for twenty three: years in the treatment of 
intermittents, he was satisfied that it was not in- 
