18 ADVERTISEMENT TO 



season, it was remarkable to see the different degrees 

 of Inxuriance exhibited by the same species of grass 

 on different soils. The superior grasses formed 

 nearly a convex ridge ; beginning at the poor sili- 

 ceous sand, No.l, where they were most diminutive, 

 they gradually increased in luxuriance, till they 

 reached the bed of alluvial soil. No. 9, and afterwards 

 decreased in quantity of produce, till they terminated 

 at the barren peat. No. 12. It is right to observe, 

 however, that after the second year, this order of 

 luxuriance did not continue in the same proportion. 

 The rich siliceous sand decreased annually after the 

 second year. The produce of the sandy loam and 

 clayey loam continued much the same ; but the rich 

 alluvial soil, and the rich clayey loam, increased in 

 the quantity of produce till the fifth year, and have 

 since continued, with but a trifling diminution, 

 though no manure has been applied. 



The principal use of this experiment was to show, 

 not only the various degrees of fertility of each soil 

 respectively, but also to show how far the inferior 

 descriptions might be improved by an intermixture 

 of those which were superior. On this part of the 

 subject, the author has entered into some elaborate 

 calculations, to show the necessary extent and cost of 

 improving an acre of poor siliceous sand, by laying 

 upon it a dressing of tenacious clay ; thus changing 

 it into a sandy loam when thoroughly incorporated ; 

 a result which is perfectly practicable, but rarely 

 executed, on account of the expense, labour, and loss 

 of time which would be incurred. 



