By the Chevalier Francis de Paula Schrank. 401 



Between the sides of the troughs, spaces of eight feet and a 

 half in width are left, which are divided length-ways into 

 three parts, that is to say, into two pathways along the 

 troughs, and a middle part, rather concave, and five feet 

 broad. This middle part is filled at the bottom with a thick 

 layer of strong loam, upon which garden mould, or finer 

 soil, is put in sufficient quantity to receive the bog-plants.* 

 The concave shape alone is calculated to retain the moisture 

 underneath, longer than a level space would be qualified to 

 do; but it is also provided that the moisture may be 

 increased at will, by letting out the water from the trough 

 into the cavity, by means of apertures at the ends, where 

 the trough turns (Fig. 1. e.), and where, for this purpose, 

 a small inclination has been contrived to cause the water to 

 fall. But since these beds are too long to be irrigated 

 sufficiently from one point, an aperture is again made 

 half way in each side of the troughs (Fig. 1. «.) by these 

 means, the beds are watered from two distinct points. 



After the water has flowed through all the troughs, the 

 residue is taken off by a drain (Fig. 1. D.) of sufficient 

 depth to keep the surrounding ground from becoming too 

 damp; which is easily accomplished, as it runs into a 

 bottom of coarse sand, which is of immense depth all 

 around Munich. 



* We may presume, that the author, instead of making the bed for the bog 

 plants of loam and garden mould, would have recommended peat earth, if that 

 had been wilhin his reach. But that species of soil, we are informed, is not 

 to be met with, in those parts, where he resides. We know that it is the best 

 suited for the cultivation of the plants in question. Under certain circumstances, 

 it may be improved by a mixture of loam. Secretary. 



