24: 



CHEMICAL MANUEES. 



together by a calcareous paste. These nodules have an analogous 

 composition with the brown grains. The calcareous tufa of Maest- 

 richt, itself phosphatic, rests on them. Other pockets, containing 

 a chestnut-coloured phosphatic sand, like a highly ferruginous sand, 

 tests 60 per cent of tribasic phosphate. This sand, which coats 

 the sides of the excavations, is only about 30 cm., say 12 inches 

 thick. It consists of the same small phosphatic grains that are 

 met with in the brown chalk. The phosphatic chalk of Mesvin 

 and Ciply, like that of Somme, is not commercially utilizable, but 

 its extreme friability, and the facility with which the phosphatic 

 grains are detachable from their chalky envelope, enable it to be 

 enriched and to bring its content up to 50 and even 60 per cent of 

 phosphate. It suffices to pulverize it and to submit it afterwards 

 to an ascending current of air which removes the chalk dust and 

 leaves the small heavier phosphatic grains, or to roast it slightly 

 and to wash it in mechanical preparation plant. Other important 

 phosphatic deposits occur in the district of Liege, at Eocour, 

 Yottem, Hesbaye, on the right bank of the Meuse. It likewise 

 occurs at Liers, Yoroux, Milmort, Ans and Monteguee. 



TABLE XII.— ANALYSES OF LIEGE 



Water .... 

 Chemically combined water 

 Phosphoric acid 

 Carbonic acid 

 Soluble silica 

 Lime 



gnesia 

 Oxide of iron and alumina 

 Calcium fluoride, calcium sulphate, etc. 

 Insoluble ..... 



