[Note 558.5]

1 note
Broken bits are probably broken bits of soap. Soap was bought in blocks. It was expensive and used economically any bits were saved. To be knocked up exhausted or tired out; to become unserviceable; to break down. Snuff is a preparation of powdered tobacco for inhaling through the nostrils [OED] but in this context, it seems to mean vitality, perhaps derived from the invigorating effect of snuff.