Baron Humboldt, whose analytical mind always strives to classify, systematize and _tabularize_ his investigations, has endeavored to ascertain and limit the maximum _height_ at which the cane may be cultivated; but it is probably true that all such attempts, are altogether visionary, in a country of great inequalities of elevation, shelter and exposure. Many local causes, altogether independent of relative elevation may produce the degree of heat requisite to bring cane to perfection, yet it is generally conceded that the produce of a plantation in the table land would not equal that of an estate near the coast. The valley of Cuautla, for instance, is bounded on the north by the lofty peak of Popocatepetl, against whose _snows_ the fresh verdure of the cane, and the graceful branches of the palm are constantly relieved. In an hour or two after leaving the plantation of Santa Iñez, the traveller who passes thence towards the valley of Mexico, finds himself obliged to put on his cloak or _serape_, after having suffered from tropical heat during the preceding day. It might reasonably be supposed that the vicinity of such immense masses of ice and snow would naturally affect the temperature of the adjacent valley; but the frosty peak of Popocatepetl only serves to condense the vapors that drift inland from the sea and to set them free over the low and warm valleys which border its southern base, whilst its broad shoulders protect the plains from the cold blasts of the north wind. COFFEE.