six drops in a minute
...Thoreau's Journal: 16-Mar-1856
The red maple is now about an inch deep in a quart pail,—nearly all caught since morning. It now flows at the rate of about six drops in a minute. Has probably flowed faster this afternoon. It is perfectly clear, like water. Going home, slipped on the ice, throwing the pail over my head to save myself, and spilt all but a pint. So it was lost on the ice of the river. When the river breaks up, it will go down the Concord into the Merrimack, and down the Merrimack into the sea, and there get salted as well as diluted, part being boiled into sugar. It suggests, at any rate, what various liquors, besides those containing salt, find their way to the sea,—the sap of how many kinds of trees!