Sentence:  I made a speaking trumpet of my hands and commenced to whoop “Ahoy!” and “Hello!” at the <WSD>top</WSD> of my lungs. ... The Colonel woke up, and, after asking what in brimstone was the matter, opened his mouth and roared “Hi!” and “Hello!” like the bull of Bashan. 
Meaning of the word marked with <WSD> tags:  Highest pitch or loudest volume.