Sentence:  "...having very long suspended our conference about the freshly mention'd Subject, it was so newly begun when you came in, that we shall scarce need to repeat any thing to acquaint you With what has pass'd betwixt us before your arrival, so that I cannot but look upon it as a fortunate Accident that you should come so <WSD>seasonably</WSD>, to be not hearers alone, but we hope Interlocutors at our conference." 
Meaning of the word marked with <WSD> tags:  In due season; at an opportune or fitting time.