Sentence:  The soldiers in charge of the English, puzzled apparently how to secure them, conceived the barbarous idea of diving the whole number into a cell which would have been overcrowded with ten captives during the <WSD>sultry</WSD> heat of a Bengal midsummer night. The hundred and forty-six unfortunate prisoners were crushed into the narrow space. 
Meaning of the word marked with <WSD> tags:  Hot and humid. (from late 16th c.)