PHARMACOPC:IAL VEGETABLE DRUGS. 
In the form of a decoction of its chips, logwood has been a favorite 
in domestic medicine, and owing to its mild astringency it has been 
used for a considerable time by licensed physicians. In 1746, under 
the name of Lignum tinctile Campechense, it became official in the 
London Pharmacopoeia. 
HAMAMELIDIS CORTEX ET FOLIA 
Witch-hazel, Hamamelis virginiana. The decoction and infusion 
of the bark as well as of the leaves of this shrub have been in com- 
mon use from the days of the American Indian, whose use of the plant 
led the settlers to its employment. They also used the leaves as 
well as the pounded bark in the making of a poultice for topical use 
in inflammations. ‘These domestic uses of the drug led to its intro- 
duction by the medical profession at an early date. A mixture of 
hydrastis root and hamamelis leaves was held in high repute by Pro- 
fessor John King, M. D. (356), as a wash and as an injection. The 
preparation known as distilled hamamelis, or distilled extract of hama- 
melis, introduced by Pond about the middle of the nineteenth century, 
became very popular and has an increasing demand at the present time, 
a substitute or imitation being introduced into the pharmacopceia under 
the title “hamamelis water.” 
HEDEOMA 
American pennyroyal, Hedeoma pulegicides, is a fragrant herb, 
native to America, and generally distributed throughout the temperate 
portions of North America. It was used by the Indians in the form 
of decoctions and infusions, and was introduced by them to the settlers, 
- coming thence to the attention of the medical profession. Its chief use 
at the present time is in the making of the volatile oil distilled there- 
from. This plant must not be confused with the pennyroyal of Europe, 
a small, aromatic herb, Mentha pulegium, common throughout Europe, 
extending northward to Sweden, eastward to Asia Minor and Persia, 
and southward to Abyssinia and Arabia. The European pennyroyal, 
also a common domestic remedy, has fallen into therapeutic neglect by 
the profession. 
HUMULUS 
Hops (Humulus lupulus) is a climbing vine found in thickets 
and along river banks throughout Europe, and extending to and be- 
yond the Caucasus and Caspian regions. Introduced into America, 
hops have become acclimated, and especially in the Northwest are cul- 
tivated in immense quantity. Hop gardens existed in France and Ger- 
many in the eighth and ninth centuries, and “Bavarian hops” were 
esteemed in the eleventh century. It has been asserted that William 
the Conqueror, 1069, granted the use of land for hops in England. The 
original use of hops was in decoction as a stomachic medicine, whilst 
their employment in the making of malted liquors 1s familiar to all. 
As a tonic, the hop is still valued in simple decoction and in extract, 
both by the people and the profession of medicine. 
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