Final answer:
The other kind of poison referred to by the story's title likely symbolizes prejudice and negative human attitudes, as seen in Harry's reaction to Dr. Ganderbai, which conveys a metaphorical 'poisoning' of their relationship.
Step-by-step explanation:
The story in question seems to be addressing the topic of poison in a metaphorical sense, referring to not only the literal venom from a dangerous creature like the krait but also the more insidious forms of poison that can exist within human interactions and attitudes, such as prejudice, suspicion, and misunderstanding. Harry's reaction to Dr. Ganderbai at the end of the story could suggest an underlying tension or prejudice that is the 'other kind of poison' alluded to by the story's title. This metaphorical poison could represent the harmful effects that such negative emotions and biases can have on relationships and society.