Premise:
"At one time it was a very miserable valley, a swampland conducive only to breeding malarial mosquitoes."
Hypothesis: This valley was once home to only mosquitoes.

yes

Premise:
"To take the fragment of green material first, I found it caught in the bolt of the communicating door between that room and the adjoining one occupied by Mademoiselle Cynthia. "
Hypothesis: I found the fragment of the green material caught in the door bolt.

yes

Premise:
"The Secretary has determined that there is good cause under section 553(b) of the Administrative Procedure Act to not issue a notice of proposed rulemaking because it would be impracticable, unnecessary, or contrary to the public interest."
Hypothesis: The Secretary determined that the proposed rulemaking was impracticable, but allowed it anyways.
it is not possible to tell