In a few moments the cause was known. The boiler of the steam-tug A.S. Field, lying at the dock between Bates and Randolph streets, had exploded, and the boat was a total wreck. Thither the ...

About 2 o'clock, when the conflagration raged with unusual vehemence, a steam-tug arrived in the stream, and, after taking up a position to the southward of the fire, commenced throwing four ...