This remedy will not effect worms or digestive distress, though it might increase the feeling of camaraderie between horse and owner. Lard, like linseed oil, is purgative, though not as effective. Nevertheless, it should cause some worms to pass. The molasses is a sweetener. Copperas is hydrated ferrous sulfate, an antihelmintic.
Tobacco is also an effective antihelmintic.
The added combination of ashes, addressed under gunpowder cures, should make this a sure-kill wormer. For Distemper Smoke them with greasy tarry rags. Distemper is a viral infection which effects the respiratory system. Smoke was a common treatment of the symptoms, but had little effect on the infection. Put a bran poultice around the neck.