2067. The plant-houses in the botanic garden at Nymphenburgh afford a specimen of a range of houses with opaque roofs at a more advanced period, and on a large scale. In fig. 597., A is the ground plan of the three hothouses and the greenhouse; B is the general elevation; C is a section through the palm-house; and D a section through the central greenhouse, with the attendant's house behind. In these houses the front glass forms an angle to the horizon of 71ï¾¦ agreeably to the directions of Boerhaave.; and the interior of the hothouse is heated by German stoves, concealed among the plants, and supplied with fuel from the sheds behind.