312 Hlare’s Eudiometers, &c. 
with proof spirit. Itis more difficult and expensive to pre- 
pare the extract than the tincture, and the latter in most in- 
stances is the most eligible preparation. 
Its virtues are aromatic, tonic and narcotic; and it is, # 
believe the only article in which these properties are com- 
bined. Our country abounds with vegetable bitters and 
tonics, many of which are more powerful than the hop, but 
there is perhaps none which can so-properly be denomina- 
ted a stomachic. That family of symptomaiic diseases 
which are the consequence of exhausted excitability, or 
more directly of an enfeebled and deranged state of the 
stomach and bowels, are certainly much relieved by this 
medicine. [t frequently induces sleep and quiets great 
nervous writation, without causing costiveness or, impairing 
hike opium the tone of the stomach, and thereby increasing 
the primary disease, As an anodyne it will be found ineffi- 
cient compared with opium. ‘The saturated alccholic tine- 
ture, in doses of from forty to eighty drops, will induce sleep 
with as much certainty as opium in cases of long watching 
from nervous irritability ; but the same cannot be said of its 
efficacy in relieving pain. ‘This substance then, is not com- 
mended as a medicine which ought to supersede the use of 
others of acknowledged virtue, but as a useful auxiliary, 
which undoubtedly possesses properties in some respect 
peculiar to itself, and as the part of the hop altogether pre- 
ferable to any other, or to the whole as it is ordinarily used 
in tincture. 
Art. XV. Account of new Eudiometers, &c. invented by 
Rospert Hare, M. D. Professor of Chemistry, &¢. i 
the Medical department of the Unwersity of Pennsylva- 
Nid. 
Amone the operations of chemistry, none probably are 
more difficult than those called Eudiometrical, in which ae- 
riform substances are analyzed. 
Elastic fluids are so liable to contract or expand with the 
slightest change of temperature or pressure, that it is requi- 
site to have the surface of the portion under admeasurement 
exactly in the same level with that of the water or mercury 
