chapter XVII

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[Illustration: GREEN AND ROASTED COFFEE UNDER THE MICROSCOPE

Green bean, showing the size and form of the cells as well as the drops of oil contained within their cavities. Drawn with the camera lucida, and magnified 140 diameters.

A fragment of roasted coffee under the microscope. Drawn with the camera lucida, and magnified 140 diameters.]

[Illustration: BOGOTA, GREEN

Longitudinal--Magnified 200 diameters]

[Illustration: BOGOTA, GREEN

Cross Section--Magnified 200 diameters]

[Illustration: BOGOTA, GREEN

Tangential--Magnified 200 diameters]

[Illustration: BOGOTA, ROASTED

Tangential--Magnified 200 diameters]

[Illustration: GREEN AND ROASTED BOGOTA COFFEE UNDER THE MICROSCOPE

These pictures serve to demonstrate that the coffee bean is made up of minute cells that are not broken down to any extent by the roasting process. Note that the oil globules are more prominent in the green than in the roasted product]

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