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Illustrated is a cross section of a greenhouse used for growing lettuce and cucumbers. The slanting side toward the right (north) is boarded and used for forcing rhubarb. The cucumber plants are trained vertically.

Greenhouse for Lettuce and Cucumber

Illustrated is a cross section of a greenhouse used for growing lettuce and cucumbers. The slanting…

This is an illustration of raphides, or acicular crystals, from the stalk of the Rhubarb: three of the cells contain chlorophyll, and two of them raphides.

Raphides

This is an illustration of raphides, or acicular crystals, from the stalk of the Rhubarb: three of the…

A genus of plants cultivated for medicinal use and as a food. About twenty species have been described.

Rhubarb

A genus of plants cultivated for medicinal use and as a food. About twenty species have been described.

The forcing of rhubarb

Rhubarb

The forcing of rhubarb

A herbaceous plant with large leaves and edible petioles.

Rhubarb

A herbaceous plant with large leaves and edible petioles.