The delay of the arbitration tribunal in London in giving its decision in the matter of the disputed boundary in Patagonia led to a crop of wild rumours being disseminated, and to a revival of animosity between the two peoples.
The plant world falls into two great divisions, the higher or flowering plants (Phanerogams), characterized by the formation of a seed, and the lower or flowerless plants (Cryptogams), in which no seed is formed but the plants are disseminated by means of unicellular bodies termed spores.
Nature therefore has provided various contrivances by which their seeds are disseminated beyond the actual position they occupy.
Humboldt's contemporary, Carl Ritter (1779-1859), extended and disseminated the same views, and in his interpretation of " Comparative Geography " he laid stress on the importance of Iditter.
Many bird parasites belonging to the Rippoboscidae have naturally been carried about the world by their hosts, while other species, such as the house-fly, blow-fly and drone-fly, have in like manner been disseminated by human agency.