Sentence:  I wil tel you, Scholer, that unleſs the hook be faſt in his [the trout's] very <WSD>Gorge</WSD>, he wil live, and a little time with the help of the water, wil ruſt the hook, & it wil in time wear away as the gravel does in the horſe hoof, which only leaves a falſe quarter. 
Meaning of the word marked with <WSD> tags:  The inside of the throat; the esophagus, the gullet;  the crop or gizzard of a hawk.