Sentence:  The Veins of old Persons are apt to become varicose and this is where the greatest column of Blood—the Veins loosing their power is the cause of the disease. The Blood by this Means is not kept from gravitating to ye foot the Consequences are <WSD>Scabrous</WSD> Skin and Ulcers. 
Meaning of the word marked with <WSD> tags:  Covered with scales or scabs; "hence", very coarse or rough.