APPENDIX. 1G5 



will, induce the state of geine, best fitted for each plant, then adieu to 

 the doctrine of the necessity of a rotation of crops. The facts are al- 

 ready abundant to support the belief that rotation is unnecessary; and I 

 shall look with great interest for your next report, for a fund of infor- 

 mation on this point. That a peculiar state of geine is necessary for 

 each variety of crop, is therefore a point to which the attention of the 

 chemical farmer ought to be especially directed. It is this state, which 

 allows one farmer to raise wheat, while in the same season, with land 

 apparently the same, his neighbor fails. 



I send you the analysis of Esq. Adams' soil.* It contains no trace 

 of carbonate of lime, nor of alkaline salts. 



Soluble geine ...... 3.922S 



Insoluble geine ...... 2.6142 



Sulphate of lime ..... .7060 



Phosphate of lime ...... .9082 



Silicates (granitic sand) .... 91.8488 



100. 



The soluble geine of one analysis, 3.6914 grains, afforded 



Geine . ..... 1.9258 



Alumine and oxide of iron .... .7715 



Phosphoric acid ..... .?.^15 



Magnesia ...... .3"J96 



Loss ....... .4230 



3.6914 



I presume that the soluble geine of all soils is similarly constituted. 

 All which I have examined afford these elements. I think you must 

 have misunderstood me in promising a written account of the effects of 

 using the residuum from our yard, by Webster. I know not so much 

 of the effects as you do. It contains a variable portion of phosphate 

 of lime ; and its average constitution is sulphate of lime 85, phosphate 

 of lime 15—100. 



^ This refers to the farm of \Vm. Adams. Cheimsford, Middlesex Co., noticed in pnge 97. 

 His farm lies on the Merrimack river and embraces a large extent of alluvial land. On these 

 ETieadows, as he assured me, he had been in the habit for twenty years past of raising- 

 wheat : and that in the course of that lime he had suffered only from one failure. He stated 

 likewise that he had never applied any lime to his soil. H. C. 



