90 



feo procure it free from other rock material that could in any way modify 

 the chemical composition of the sample. 



In order to afford an idea of its state of sub-division, it may be men- 

 tioned that a mechanical analysis of the shale as collected gave the fol- 

 lowing 1 results : 



Pebbles- 12-55 



Coarse gravel 12'70 



Fine gravel 36*55 



Coarse sand 10*74 



Fine earth (by difference) 26'75 



Moisture '71 



Total 100-00 



Tir.c chemical analysis of this sample yielded the following resulta: 



Percent, of Percentage of Soil sifted through Percentage of Soil sifted 



Field 1 mm. Sieve. through mm. Sieve. 



Sample. Pho- 



No. Fine earth. Water. Organic Chlorine. Nitrogen. Lime. Potash. phoric 



matter. oxide 



1. 



1-86 



-476 



120 



It is obvious that the disintegration of these purple shales will pro- 

 duce a. very fertile soil, and indeed it was the known fertility of soils 

 into whose composition the shales had appeared to enter that led to th 

 selection of this sample for analysis. 



MOSSEL BAY. 



No. 



1. 

 2 



3' 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 



Field Cornetcy. 

 South Middelveld. 



(Officially collected.) 



Farm or place. 



Buff els Drift. 

 Hartjesfontein. 



Collector. 

 J. Muller. 



Upper Gouritz River. Hemelrood. 



Heuningbosch. 



Before Attaquas Kloof. Hagel Kraal. 



Brak River. 



Mossel Bav. 



Ruiter Bosch. 

 Hartebeeste Kraal. 



j> 

 Great Brak River. 





 Klipheuvel. 



Geelbeks Vallei. 



Hartenbosch. 



Patrysfontein. 



Entering the Mossel Bay Division from Riversdale, at the farm 

 Buffels Drift, which lies on the boundary of the two divisions, a typical 

 sample of river soil was collected. No. 1 in the above list. The Gourit* 



The signification of *a,ch of these terms will be explained later, under the head of 

 il Phji*l composition of soils." 



