For the venous state of the blood itself the chlorate of potassium and the Peroxide of Hydrogen have been used with undoubted benefit.
Ferrum is a most likely medicine indeed on theoretical grounds and from analogy; the sixth trituration of the phosphate is very potent in controlling the vascular system and it simultaneously affects the blood mass.
And referring again to Rhus: There is also not wanting evidence of its action on the venous system which, though not great, still is there: “Swelling of the anal region, haemorrhoidal tumours” It seems also to act pretty strongly on muscle.
The best study of Rhus with which I am acquainted is Carroll Dunham’s (Lectures on Materia Medica, 1879, P. 121, et seq.), and this eminent man says (P. 127): it produces an apparent passive congestion of the heart.
That Rhus is an important cardiac may alone be deduced from its reflected action upon the skin. It is also undoubtedly a blood medicine.