126 HORTUS GRAMINEUS WOBURNENSIS. 



In the following details of experiments, the nature of the subsoil 

 is therefore mentioned, and more particularly in instances where 

 one soil has been cultivated on different subsoils. 



The most productive old pasture lands consist of soils of an 

 intermediate quality as to moisture and dryness, varying in the 

 degree of fertility according to the manner of management, or the 

 frequency of hay crops, and the exclusion of top-dressing with 

 manure ; but the grasses which constitute their produce are the 

 same. Dry elevated soils, however long they may have been 

 under pasture and superior management, produce a different class 

 of grasses of inferior merits. The produce of peat bogs, and low 

 wet soils likewise, for the most part, consists of grasses which 

 differ from those above mentioned, in regard to value as well as 

 botanical distinctions. The respective merits and comparative 

 value, therefore, of the different grasses natural to these particular 

 situations, will probably be more readily and conveniently seen, if 

 eveiy species be considered under its own particular soil, and 

 compared with those that are naturally combined with it. 



