This mullah, Mahommed bin Abdullah by name, had made several pilgrimages to Mecca, where he had attached himself to a sect which enjoined strict observance of the tenets of Islam and placed an interdiction on the use of the leaves of the kat plant - much sought after by the coast Arabs and Somali for their stimulating and intoxicating properties.
If the primary wave at 0 be cos kat, the effect of the secondary wave proceeding from the element dS at Q is dS 1 dS - p cos k(at - p+ 4 A) = - -- sin k(at - p).
The names of the kat and tema are fixed by being found on weights, the uten by inscriptions; the series was --
One of these, a wooden building in the centre of the town, gives it its name (kat = wood).
The kat plant, a medicinal herb which has a tonic quality, is largely grown in the Harrar province.