400-6 
their name to specify the body as found in them—(Caffee-tannic Acid, Quzno- 
tannic Acid, Catechu-tannic Acid, Azwo-tannic Acid, etc.). With gelatine, these 
tannins form an insoluble compound; and with ferric chloride they yield bluish- 
black or green precipitates. They combine readily with animal skin, giving it the 
property of resisting putrefaction, which forms part of the process called tanning. 
Resin, gum, pyrocatechin,* extractive matters, and the — plant constituents, 
are also found.+ 
PHYSIOLOGICAL ACTION.—Should we prescribe on the palliative principle, 
and at the same time believe in disinfection by killing germs, I could hardly 
point to a drug more adapted to diseases of the kidneys, bladder, and urethra 
than arbutin, which is changed in the renal tract to hydrokinone, a sort of phenol, 
which is in itself a germicide, the arbutin being more or less innocuous and at the 
same time a diuretic; it has, however, caused an eruption of the skin. 
Uva-Ursi itself causes vomiting and purging, involuntary passage, bloody and 
green urine, and reduces the heart's action ; further than this little is known of its 
direct effects. Si ie 
get 
_ DESCRIPTION OF PLATE 100. 
1, End of a flowering branch. 
ae o Fruiting branch, Salem, Mass., Nov. 22, 1886. 
ie Leal, under surface. 
: Flower. _ 
5. Li inadinal section of flower. 
+: Stamen, front and side Views oe 
8. Drupe. | 2 ; 
g. Pyrenz consolidated i int 
1o. Transverse section of ay pyren 
i Lodgeadianl section of a seed. 
13. Horizontal section of a seed, 
14. Section of ovary. 
15. Separate pyrena. 
sus 5 s euareee) . 
a See page 40-2. aoe oon 
- Further bibliography in this depiauesls "ey 
¥, 401; Am. Four, Pkar., xxvii, 334; 1873, 1 
> > , , 975 < 
are! Schorlemmer, Chem. Carb. o- x Me ee eee : 
_ g Lewin, ia Fee 
: Gmelin, Cheek, XV, 419, xvi, 2 28; His. ‘our ‘ 
39; Chem, Gaz, a abi ‘Witstein, oe Const, : 
