A Scientific Harvest. --Von Humboldt in his report on Hemprich and Ehrenberg's late travels, undertaken at the expense of the Prussian government, through the Libyan Desert, Egypt, Sennaar, Dongola, Lebanon, Arabia, &c., bears this honourable testimony to their industry and talent:--" They collected as if collecting alone had been the object of their pursuits; with respect to preparations, preservation, and specific denomination of their subjects, they laboured beyond what any other travellers have laboured under similar circumstances. The specimens, transmitted to the Royal Museum, fill one hundred and fourteen cases, varying from twenty to thirty cubic feet each. The total number of preserved specimens of plants exceeds 46,000, amongst which are 2900 species; of animals there are 34,000 individuals, amongst which there are 135 distinct species of mammalia, 430 kinds of birds, 546 sorts of fish and amphibious animals, 600 species of anelides and crustaceae, and 2000 kinds of insects. The Royal Cabinet of Minerals has been enriched with 300 specimens of mountain formations. Yet this is but a secondary consequence of their labours." -- Mem. of the Physical Class of the Royal Academy of the Sciences at Berlin.