My informants gave me to understand that for one hundred men, 10 doti, or 40 yards of cloth per diem, would suffice for food.  The proper course to pursue, I found, was to purchase 2,000 doti of American sheeting, 1,000 doti of Kaniki, and 650 doti of the coloured cloths, such as Barsati, a great favourite in Unyamwezi; Sohari, taken in Ugogo; Ismahili, Taujiri, Joho, Shash, Rehani, Jamdani or Kunguru-Cutch, blue and pink.  These were deemed amply sufficient for the subsistence of one hundred men for twelve months.  Two years at this rate would require 4,000 doti = 16,000 yards of American sheeting; 2,000 doti = 8,000 yards of Kaniki; 1,300 doti = 5,200 yards of mixed coloured cloths.  This was definite and valuable information to me, and excepting the lack of some suggestions as to the quality of the sheeting, Kaniki, and coloured cloths, I had obtained all I desired upon this point.

Second in importance to the amount of cloth required was the quantity and quality of the beads necessary.  Beads, I was told, took the place of cloth currency among some tribes of the interior.  One tribe preferred white to black beads, brown to yellow, red to green, green to white, and so on.  Thus, in Unyamwezi, red (sami-sami) beads would readily be taken, where all other kinds would be refused; black (bubu) beads, though currency in Ugogo, were positively worthless with all other tribes; the egg (sungomazzi) beads, though valuable in Ujiji and Uguhha, would be refused in all other countries; the white (Merikani) beads though good in Ufipa, and some parts of Usagara and Ugogo, would certainly be despised in Useguhha and Ukonongo.  Such being the case, I was obliged to study closely, and calculate the probable stay of an expedition in the several countries, so as to be sure to provide a sufficiency of each kind, and guard against any great overplus.  Burton and Speke, for instance, were obliged to throw away as worthless several hundred fundo of beads.

For example, supposing the several nations of Europe had each its own currency, without the means of exchange, and supposing a man was about to travel through Europe on foot, before starting he would be apt to calculate how many days it would take him to travel through France; how many through Prussia, Austria, and Russia, then to reckon the expense he would be likely to incur per day.  If the expense be set down at a napoleon per day, and his journey through France would occupy thirty days, the sum required forgoing and returning might be properly set down at sixty napoleons, in which case, napoleons not being current money in Prussia, Austria, or Russia, it would be utterly useless for him to burden himself with the weight of a couple of thousand napoleons in gold.