He was lethally poisoned by the cobra and died a day later of it.

...its innards hummed and buzzed, clicked and purred, whizzed and clacked and whirred, and made other annoying clockworky noises...

When Timothy and Julia hurried up the staircase to the bedroom floor, where a considerable commotion was taking place, Tim took Barry Leach with him. […]. The captive made no resistance and came not only quietly but in a series of eager little rushes like a timid dog on a choke chain.

Ashes boil'd in Water ; and and filtrated