XX PREFACE. 
diuretic . 1 5 . Different Preparations 
of the fame Plant often produce f undry 
Effecls : A DecoElion of Elder-bark 
purges, but its Powder does not : A 
DecoElion of Afh-keys vomits, but the 
Salt of the Wood given with Diuretics 
is a powerful Sudorifc. No volatile 
Plants can bear Boiling ; nor Ajlrin- 
gents, or Bitters , Dif illation. 1 6. The 
fame Forms of a Plant s Prepas'ation 
-may differ in its Effects, as to the 
Time of its Preparation : Thus, Ala- 
rum, figbtly boiled, purges ; long 
boiled, it is diuretic : The snore it is 
beaten, the more diuretic , and lefs 
purgative ; the lefs it is beaten, the 
more purgative. 17. Plants may 
fometvnes have different Effects , ac- 
cording to the different Times they are 
got in ; all Herbs, gathered too young, 
abound more with an Acid than they 
do after. CarduusBenedidlus^^^ra/ 
in June, is vuhierary, but not fo 
after : Unripe Chefnuts purge, but 
the ripe do not . How many tender 
young Buds are eaten in the Springs 
which 
