VlvLn-r.UKNING KXPKKIAflCNTS AT CROliN KLOOF, PRKTORIA. 29I 



Z'anabHis is frequent, and Hypericum a-thiopiciim rare, both 

 being found only in open patches. 



The plot C is much the same as D, but Anthistiria imberbis 

 is more prominent, and in some patches it grows to the exclusion 

 oiTrachypogjii polymorpJiiis. On the whole, the grass is not so 

 luxuriant as on D, and Vigna augustifolia appears to be more 

 common, thoui^h this may only be due to the fact that the tall 

 Trachypodou polyinorphiis dees not dominate to the same extent 

 as on 1^. and the bushes are better seen among the shorter 

 Anthistiria. At the upper right-hand corner of the plot Anthis- 

 tiria imbcrbis is the sole dominant grass, and hardly a specimen of 

 Trachypogon polyniorphns is to be seen amongst it. In one 

 locality a clump of Andropogon Biichan-ani grows amongst the 

 Anthistiria.. 



Photographs of the vegetation were taken from time to 

 time, and are reproduced in Plates XXXI-XXXIII. 



Temperature Records. 



Temperature readings were made with a view to finding 

 out how a dense covering of vegetation afifected the temperature 

 of the soil. The m.ethod adopted has not given absolute results; 

 but, as the conditions under which the readings were taken were 

 the same in each case, I think the results obtained can be fairly 

 compared. Two holes, about 12 inches deep and about 50 yards 

 apart, were dug, one on the plot D (densely covered with 

 Anthistiria imbcrbis), and tlie other on E^ (which was bare owing 

 to it being recently burnt). In an oblong tin I fixed a maximum 

 and minimum thermometer, and placed the tins in the holes. 

 Both tins were covered with aliout 3 inches of soil, and in addition 

 that on D was covered with grass. A third maximum and 

 minimum thermometer, fixed in exactly the same way, was placed 

 in an exposed place so that it had no shade during the day. All 

 the thermometers were read, as far as possible, once a week, and 

 the following are the results: — 



