Master Bates was also attentive to the play; but being of a more excitable nature than his accomplished friend, it was observable that he more frequently applied himself to the gin-and-water, and moreover indulged in many jests and irrelevant remarks, all highly unbecoming a scientific rubber.
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The sentence should be deleted because it introduces information that is irrelevant to the passage.
The writer should deleted the sentence because it provides background information that is irrelevant to the paragraph.