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Oct. 14th 1878

Pulvinus gradation

In Sida the pulvinus consists of a mass of small cells the without chlorophyll arranged with their longer axis perpendicular to the axis of the petiole. They are parallelograms in shape, the smaller medium ones being (HKV2) 5° to 0.7 (microm) × 2 or 3 they are regularly arranged in 15 or 20 rows each row parallel to axis like cork cells or cambium, The well defined ordinary parenchyma cells are elongated parallel to the axis of petiole are are 10 × 5 (HKV2) & or 15 × 7 — There is no abrupt line of demarcation between pulvinus & ordinary parenchyma, but one can take a space of 50° (HKV2) & say at the stalk end it is ordinary parenchyma at the pulvinus end it is small cells between the ends is a fair gradation, & one sees cells which one cannot say are elongated in one direction more than another

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