If, in order to ascertain this, medicines be given to sick persons only, even though they be administered singly and alone, then little or nothing precise is seen of their true effects, as those peculiar alterations of the health to be expected from the medicine are mixed up with the symptoms of the disease and can seldom be distinctly observed.

If, in order to ascertain this, medicines be given to sick persons only, even though they be administered singly and alone, then little or nothing precise is seen of their true effects, as those peculiar alterations of the health to be expected from the medicine are mixed up with the symptoms of the disease and can seldom be distinctly observed.