146 Extracts from the Journals. Jan., 



7. The potash sohition was acidulated with chlorhydric acid, 

 and precipitated by carbonate of ammonia, yielding, after being 

 thoroughly washed, dried and ignited, 6.55 grains of alumina. 



8. The ammoniacal solution filtered from oxide of iron and 

 alumina, was treated for phosphate of lime, and afterwards with 

 oxalate of ammonia, and, allowing ample time to precipitate, the 

 oxalate of lime was filtered, washed, converted into carbonate, 

 and in that state weighed, giving 6.7 grains. Converted this, by 

 exposure three times to a white heat, into caustic lime, weighing 

 exactly 3.8 grains. 



9. The liquid from which oxalate of lime had been filtered, 

 was now with the usual precautions precipitated wuth ammonio- 

 phosphate of soda, the precipitate cautiously washed, and the 

 double phosphate ignited, giving phosphate of magnesia 5.18 

 grains, equivalent to 1.89 grains of magnesia. 



10. To the liquid filtered from ammonio-phosphate of magnesia, 

 added sulph. hydrate of ammonia, and obtained calcined precipi- 

 tate from the .3 grain of oxide of manganese, 



11. A third portion of 100 grains of the soil, treated for car- 

 honic acid with all the precautions of boiling the liquid, and al- 

 ternately cooling off ten times, until the pure baryta showed no 

 more carbonic acid, and the successive weighings gave identical 

 results, the quantity of that ingredient was found to be only 1-4 

 grains. Hence the soil is composed of 



100.45 

 The excess is here attributable in part to the peroxidation of the 

 iron, which in the soil is partly in the state of magnetic oxide, 

 and in part to the presumed slight amount of potash still adhering 

 to the oxide and alumina. 



Sand taken from the thermal spring of Okme, on the Southern 

 frontier of the Province of Bidir-el-Hagrr, on the Western 

 bank of the JVilc — where the temperature of the water is 131° 

 Fah. 

 This sand obviously contains the debris of granitic rocks. Par- 



