Depretis recalled Nigra from Paris and replaced him by General Cialdini, whose ardent plea for Italian intervention in favor of France in 1870, and whose comradeship with Marshal Macmahon in 1859, would, it was supposed, render him persona gratissima to the French government.
The most remarkable Roman building in Trier is the Porta Nigra, the north gate of the city, a huge fortified gateway, 115 ft.
One of the worst pests of pear trees is the pear midge, known as Diplosis pyrivora or Cecidomyia nigra, the females of which lay their eggs in the flowerbuds before they open.
The black spruce (Picea nigra) is a tree of more formal growth than the preceding.
The white spruce (Picea alba), sometimes met with in English plantations, is a tree of lighter growth than the black spruce, the branches being more widely apart; the foliage is of a light glaucous green; the small light-brown cones are more slender and tapering than in P. nigra, and the scales have even edges.