Sentence:  As has been mentioned, Darts of to-day is essentially a "public-house game," and in pretty nearly every inn, club, or institute where it has a footing (and in which has it not!) will be found minor variations in play and often games that are peculiar to the locality or even to the "school" itself. ... And in this domestic circle, at all events, it is thought that this set of Rules will prove a useful guide when taken in conjunction with what has already been said as regards the board, its position, the <WSD>hockey</WSD>-line, etc. 
Meaning of the word marked with <WSD> tags:  (darts)  (oche).