-------------------------+---------------+--------------+------------- | NORTH SPRING.| SOUTH SPRING.| EAST SPRING. -------------------------+---------------+--------------+------------- Matter In Solution | 398·8 | 350·8 | 811·6 | | | Chlorine calculated as | | | Sodium Chloride | 278·4 | 238·2 | 585·5 | | | Sulphur Trioxide | | | calculated as | | | Sodium Sulphate | 62·9 | 53·9 | 126·2 The above figures are parts per 100,000 parts of water. Although the above analyses prove the water to be of a very poor quality for drinking purposes, compared with many of the wells and springs of the oases, the water, which is quite clear, seemed good. Except for its softness and somewhat ferruginous taste, it is quite palatable, and on my last visit we used no other for five days. The south spring was found to yield 21 litres and the north 6 litres per minute. The water of the third spring does not run.] [Illustration: PLATE IV. WESTERN EXTREMITY OF THE BIRKET EL QURUN.] PART II. =TECTONICS.= * * * * * SECTION VIII.—FAULTING AND FOLDING. [Sidenote: The Fayûm Depression formed by subaerial Erosion.]