Let's look at the one on blood flow first. Do you think the author stored a collection of cobwebs in a bin somewhere in case of nasty cuts? Or did she scurry around house and barn, grabbing handfuls wherever she found them?
Can you imagine the state of the injury after a few days of being bound up with cobwebs and brown sugar?
Yuck!
Now on to the second remedy.
I'm imagining an ash tray filled with twists of saltpeter encrusted paper, at the bedside of some poor asthmatic. Could the smoke possibly have been helpful, acting as a primitive nebulizer? The author seems to have personal knowledge of efficacy. Perhaps she uses the treatment herself.
I'm no fan of pharmaceutical companies, but reading this stuff sure makes me grateful for the local drug store.