Botanical Survey of South Africa Memoir No 5: Researches on the Vegetation of Natal Series I Including Accounts of Investigations on 1) the Measurement of the Size of the Aeration System of the Leaves of Certain Natal Plants by an Injection Method; 2) a New Calcium Chloride Method of Measuring the Resistance of Leaves to Water-Loss; 3) the Measurement of Light Intensities in South Africa with Special Reference to Plant Habitats; 4) the Rate of Water-Loss During the Drying of Leaves; 5) the Distribution and Ecology of Genus Cussonia (Thunb. ) / Memoir No 8 Series II Including Accounts of Investigations on 1) the Water Relations of Some Natal Plants, with Reference to the Leaves of Ptaeroxylon Utile and Portulacaria Afra; 2) the Water-Retaining Capacity of Certain Woods in Relation to Their Microscopic Structure; 3) the Water Requirement and Transpiration of a Common Natal Weed, Bidens Pilosa (L. )
Agricultural Department, Union of South Africa. 1923, First Edition. Softcover, with dust jacket. 2 issues (complete). Memoir No 5: the covers are much worn. The front cover is loose and is included. The contents are pleasing. There are faint indications of age. But, by far, the pages are clean, clear, orderly, confident. Memoir No 8 (pub 1925): the covers have some light shelving and handling wear about the edges and seams. They have scuffing, some handling marks. The spine is a little worn, but the aged staples are still firm, fit. The contents are most agreeable. They are fresh, clean, clear, neat, tidy. fk. Very Good/No Jacket.
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