INTUODUCTOEY. 9 



metres long by nine wide;^ the otlier side of the 

 square being composed of two guard-houses. In 

 the centre is a court, with shrubs and two small 

 basins or reservoirs. In the principal building, on 

 the groimd floor, is a pavilion, in which experiments 

 which require particular care are conducted: over 

 this are the offices. The grounds are laid out and 

 interspersed with fish-ponds, ornamental plants, 

 flowers, &c. These ponds are fed partly by the 

 Ehine water, and partly by the little rivulet of 

 L'Augraben, which traverses the grounds. The spring 

 water is conducted to the buildings in which all the 

 operations are carried on by pipes entering the 

 building in three brick ti-enches, this water is then 

 TEiised to the proper height by means of pumps 

 worked by turbines, these turbines being driven by 

 the water of the Ehine. In case of any failure of 

 the supply of spring water, the water of the Ehine, 

 which has been previously carefally filtered, can be 

 turned on to the apparatus. Eows of cisterns, about 

 a yard in height, extend through the whole length 

 of the buildings. These cisterns are each about ten 

 or twelve yards long, a yard in width, and eight 

 inches deep. The ova is placed upon a glass grille, a 

 species of gridiron composed of hoUow glass bars or 

 ^ A metre equals about 39 § inches. 



