APPENDIX. 183 



4th. It is said that tobacco is largely increased in quantity, 

 but injured in quality, by applying salt as a manure. The same 

 is said of sugar-plants. 



5th. It is probable that the white beet, mangel-wurzel, and 

 carrot, among field-crops, (as is certain of asparagus in the gar 

 den, ) being originally marine plants, will be more strikingly 

 benefited by salt . than other crops, and will admit of larger 

 applications, other things being equal. 



6th. We know that many soils near saline springs, (or re 

 claimed from salt marshes,) naturally contain as much or more 

 salt than is needful for the growth of agricultural plants. 



7th. We know that in many regions (those exposed to pre 

 vailing and especially stormy winds from the ocean) the soil 

 annually receives from spray and rain more salt than is annu 

 ally removed by crops. 



Sth. We know that salt is most often injurious in dry seasons, 

 or on dry soils. 



9th. It is probable that the positively injurious eifects of salt 

 are chiefly due to its being applied in too large quantity ; for 



IQth. We know that a strong solution of salt hinders the 

 germination of seeds, and destroys the life of the growing 

 plant (marine plants of course excepted). 



\\th. We know (from the recent experiments of Sachs and 

 Knop in Saxony) that a weak solution of salt hinders (by one 

 half or more) the transpiration of water through the plant; 

 therefore, 



12th. It is probable that a Httle salt has the effect to keep 

 the soil more humid, and thus tends to counteract drought ; 

 and, 



I3th. It is probable that a little salt, by hindering excessive 

 transpiration, (and too rapid growth ?) causes the cellular tissue 

 of the plant to develop in a firmer, healthier manner than it 

 might otherwise do ; and thus may be explained, 



\4tth. The assertion that a bushel or two of salt per acre on 

 grain crops prevents falling (laying or lodging) of the straw. 



