222 



REPORT OF CHEMICAF, LABORATORY 



good quulity of whiit is known us ' 

 tukon from luanv loculitics and runL'f 



' flit " liiMo. As will 1)1' seen, these sninpluH have been 

 DVtT priietifally the whole of the Sudan. 



Character 



I^ocality 



Analyses of l*''! 

 limestones 



Hltiolc nodnlnr m.-i^'-i's luiMni in "in 

 White „ 

 Boot sha])cd 

 II II 11 II II 



II II n 



Nodulas from river lank 

 „ in soil 

 „ on surface of soil 

 Nodules 



White crystallino limestone 

 Pink 

 Coarse granular stone 



Crystalline 



Nodular ... 



II 



„ from river hank... 



II t) •■ '.. 



11 II II II ..• 



Blue Nile banks 



Hor 



Binney and Patoyitch 

 Bet. Tnufikia and Bor 

 Sobat at Abwong 

 Near Roseires 



II II ■ • ■ 



J. Qereiris.sa ... 

 Sabdemt near Kassala 

 Bor Wood Station 



QhabaShambe 



near Tantikia . . 



I, Mehit 



Lower Bahr cl Qhazal 



^•8 



82-57 

 78-48 

 46-47 

 50-27 

 59-45 

 73-70 

 72-95 

 66-40 

 75-62 

 87-50 

 94-45 

 43-15 

 66-25 

 72-30 

 69-5U 

 71-55 



4-lC 2-C9 1.97 



4-83 5-00 2.66 



5-00 6-88 



2-66 5-20 



3.45 

 2.87 



2-78 I 3-14 1.84 



3-00 

 2-88 

 4-25 

 0-22 

 1-21 

 2-34 

 3211 

 41G 

 3-02 

 4-84 



3-04 

 5-43 



2.16 

 3.52 



77-95 4-18 



72-23 



4-12 



3-24 ; 2.56 

 0-50 

 0-65 

 2-70 

 0-.30 

 .•i-80 

 3-10 

 4-10 

 2-77 

 5-30 



7-20 

 28-35 

 22-65 

 18-05 

 16-85 

 17-65 

 20-50 

 12-85 

 11-35 



3-00 



ll."> 



I 



10-20 

 35-65 

 29-85 

 23-55 

 20-80 

 22-35 

 20-75 

 16-40 



;")l-70 



19-30 

 23-80 

 18-70 

 14-20 

 17-40 



No. 198 was furnished by Kaiin. It. TI. Wilson. 



Sl'dan "Gum Arabic" 



Gum arabic has been known from the remotest antiquity. Nearly 2,000 years B.C. it 

 was used by the Egyptians in the fabrication of colours for painting. The gum was collected 

 in the valley of the Nile from the Arnrid Arahim, whidi formerly grew there in abundance, 

 but the greater portion was imported into tlir lountrv liv vessels coming from Aden, which 

 port probably derived its supply only in part from the interior of Arabia — -a portion having 

 its origin along the .Somali coa.st. J^ater, under Roman domination, and in the I\Iiddle Ages, 

 the gum exported from Aden was chiefly, if not entirely, that from Somaliland. JIuch larger 

 quantities were produced in Arabia and exported from Jcddah, on the Red Sea to Europe. 

 At the present time the Arabs pay comparatively little attention to the production of gum, 

 the two great gum producing countries being the Anglo-Egyptian Sudan and the French 

 Colony of Senegal. 



During the years of tlic ])(rvisii occupation, trade in gum ceased; but with the 

 reconquering of the Sudan it was renewed, and it is expected that thr Sudan product will 

 regain its former place in the front rank of tin- trade of this article. 



In the Sudan, as in Senegal, gum is extided from a innnber of varieties of acacias, but, 

 in both countries, the chief variety, ami tliat furnishing the class of gum which has the 



