When I left the north, on my way to the city of Foo-chow-foo, on the river Min, in the province Fokien, I had no doubt that I should find the tea hills there covered with the other species, _Thea Bohea_, from which we generally suppose the black teas are made; and this was the more likely to be the case as this species actually derives its specific name from the Bohea hills in this province. Great was my surprise to find all the plants on the tea hills near Foo-chow exactly the same as those in the green tea districts of the north. Here were, then, green tea plantations on the black tea hills, and not a single plant of the _Thea Bohea_ to be seen. Moreover, at the time of my visit, the natives were busily employed in the manufacture of black teas. Although the specific differences of the tea plant were well known to me, I was so much surprised, and I may add amused, at this discovery, that I procured a set of specimens for the herbarium, and also dug up a living plant, which I took northward to Chekiang. On comparing it with those which grow on the green tea hills, no difference whatever was observed. It appears, therefore, that the black and green teas of the northern districts of China (those districts in which the greater part of the teas for the foreign market are made) are both produced from the same variety, and that that variety is the _Thea viridis_, or what is commonly called green tea plant. On the other hand those black and green teas which are manufactured in considerable quantities in the vicinity of Canton, are obtained from the _Thea Bohea_, or black tea.