The most careful dispositions were accordingly made, with this object in view; the gig, in charge of an officer, was daily dispatched to the entrance of the lagoon in order that, herself concealed, her crew might maintain a watch upon the river and report the passage of any vessels upward-bound for the Camma Lagoon, while, so far as our own quarters were concerned, everything was allowed to remain as nearly as possible as it was before it fell into our hands, in order that, should a slaver arrive at the factory, there should be nothing about the place to give the alarm until it should be too late for her to effect her escape.  As a final precaution, a sort of crow's-nest arrangement was rigged up in a lofty silk-cotton tree which had been left standing in the screening belt of timber along the southern shore of the island, in order that a look-out might be maintained upon the approach channel during the hours of daylight, and timely notice given to us of the approach of slavers to the factory of which we were in occupation.