...Virgil says bees bear gravel stones as ballast, but their only ballast is their honey bag... 
John Burroughs 「Birds and Bees, Sharp Eyes and, Other Papers」
...At my approach he would sink deeper and deeper in the water, asif taking in ballast...
William J Long 「Wilderness Ways」
...Halfthe night had been spent in overhauling the ballast and exploring theseams, but the labor had been without avail...
Jack London 「Tales of the Fish Patrol」
...As for my boat, it could not have beenkept afloat but for the extra ballast...
Jack London 「Tales of the Fish Patrol」
...Then a couple of seas filled it, andit sank straight down, dragged to bottom by the heavy ballast...
Jack London 「Tales of the Fish Patrol」
..., employ'dgetting on board stone ballast and Airing the spare Sails...
James Cook 「Captain Cook's Journal During the First Voyage Round the World」
...Standing near the side, he had observed Rex and Fair bring up a great pig of iron, erst used as part of the ballast of the brig, and poise it on the rail...
Marcus Clarke 「For the Term of His Natural Life」
...Employed getting out Stores, Ballast, etc...
James Cook 「Captain Cook's Journal During the First Voyage Round the World」
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