It is the most important crop. Jebel Haraz, of which Manakha, a small town of 3000 inhabitants is the chief place, is described by Glaser as one vast coffee garden.
The ruins of the city of Ma'rib, the old Sabaean capital, have been visited by Arnaud, Halevy and Glaser, but call for further description, as Arnaud confined himself to a description of the dike (see below), while Halevy and Glaser were interested chiefly in the inscriptions.
If it be possible to assign to some of the monuments discovered in Arabia by Glaser a date not later than 1500 B.C., the origin of the alphabet and its dissemination are carried back to a much earlier period than had hitherto been supposed.
In the higher parts there are fine plains where Glaser found numerous Himyaritic remains, and which he considers were undoubtedly cultivated formerly, but they have long fallen out of cultivation owing to denudation and desiccation - the impoverishment of the country from these causes is increasing.