Health : the voyage to South Africa, and sojourn there.

Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: Health : the voyage to South Africa, and sojourn there. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    In these tliree terraces, we have thus a coast climate, warm and moist and equable, its winter cold moderated bj the warm sea ; a midland climate, cooler, and drier and more genial, but with a greater range of temperature, due to its altitude and the greater amount of evaporation from diminished pressure, its mean range varying from 18° to 20° ; and a mountain climate drier still, and more bracing, but with much greater extremes of temperature, cold nights and hot days, the mean range being more than double that of the lower or coast plateau. Taking Port Elizabeth, Grraham's Town, and Aliwal North as representing the three types of climates, the following taken from tables compiled by the Cape Astronomer-Royal in 1881, of four years' obseivations, 1876 to 1879, will justify these remarks, which are also substantially borne out by later and more complete tables compiled by the Meteorological Department. It will be seen that Graham's Town has the loioest mean temperature in summer, and the smallest range in tvinier, and the largest rainfall, whi.h occurring in summer cools the heat, and explains its low temperature. The humidity is also less than at Port Elizabeth, although the rainfall is ^ more (nearly 30 inches to 20 inches, at the coast station) ; whilst the dry winter reduces the range to 12-8, that of Port Elizabeth 14-1. Tempeeatuee. I g 1 w d '3 2 H 00=1-1 o 6 'A i 18761879. Mean temp. Absol. max. Absol. min. Mean of max. Mean of min. Mean range is II o 5 o S-S 1. Coast Platbau (E). Port Elizabetl alt. IftO ft. Summer Winter 66-8 59-5 94-5 97-5 48-5 43-0 75-0 67-4 60-4 53-3 14-6 14-1 75 \ 80/ 19-99 49 j S.E. N.E.& N.W. 2. Midland. Graham's Town alt. ] ,800 ft. Summer Winter 63-1 53-1 99-0 82-0 44-0 35-0 74-3 63-7 56-6 60 9 17-7 12-8 74 \ 77/ 29-59 H S.W. WSW 3. MOONTAIJf. Aliwal Nortli... alt. -i.aao ft. Summer Winter 67-4 48-8 102-0 81-7 41-0 24-0 88-2 62-6 55-8 3S-4 34-4 31-2 551 77) 22-86 89 ( S.E. N.W. 3. Mountain. Colesberf? Brdg. alt. 3,600 ft. Summer Winter 69-7 49-3 101-0 84-5 33-0 23-0 85-3 66-8 54-9 39-2 30-4 27-6 11-0 17-2 44 i 73/ 18-35 69 [ S.E. S.E. 1. Coast (W.) Wynberg alt. 250 ft. Summer Winter 61-8 55-3 96-0 92-0 42-0 ,41-5 76-2 66-4 65-2 49-2 75-) 83 j 34-62 92 [ S.E. K.W.