The underlined passage in "the invalid's story" is an example ofsec. 31: i found out, then, that i had spent that awful night with a harmless box of rifles and a lot of innocent cheese; but the news was too late to save me. . .
a. verbal irony - the narrator says they lost their health, and they did lose their health.
b. humor - the situation of them losing their health is humorous.
c. situational irony - in taking care of "the deceased," the characters lose their own health.