ESSAY 



CALCAREOUS MANURES. 



PART THIRD— APPENDIX. 



INTRODUCTORY REMARKS. 



In the foregoing exposition of theory and practice, it has been the object 

 and effort of the author to embrace whatever seemed necessary for proof 

 or for illustration ; and to omit every thing else, lest too much of amplifica- 

 tion or digression should weaken rather than strengthen the main positions. 

 Thus it is believed that the foregoing chapters, as argument and proof, 

 serve to establish the series of propositions which were at first advanced 

 and throughout contended for. Still there remained many minor but inte- 

 resting subjects more or less intimately connected with the investigation, 

 and which well deserved more extended discussion, and the consideration 

 of those readers who should desire to pursue farther the general object of this 

 essay. These subjects will be treated separately in the different arti- 

 cles of this appendix ; which may be read, it is believed, with both interest 

 and benefit by the more inquiring class of readers ; or may be passed over, 

 by the more cursory and careless, without detriment to the arguments and 

 facts of the preceding portion and regular body of the work. 



Among the most important of the subjects to be thus treated at length, 

 will be the remarkable and extensive deposites of gypseous earth, or green- 

 sand earth, in lower Virginia, and its action as manure— the formation of 

 prairies, (or lands divested of trees)— and the causes of, and remedies for 

 malaria, and its train of diseases, which serve, aided by the operation of the 

 evil legislative policy of Virginia, so grievously to afflict this now otherwise 

 most fortunate and highly blessed agricultural region. Various other arti- 

 cles will be presented, which will be but extensions of different parts of the 

 foregoing text, and which will serve as additional proofs or illustrations of 

 some of the positions before presented and maintained. 



NOTE I. — Extension of subject at page 54. 



PROOFS OF THE EXISTENCE OF ACID SOILS, FURNISHED BY THE RECEKT RESEARCHES 



OF CHEMISTS. 



Tlie 'Traitt dc Chimie' is u French translation, by Esslinger, of the volu- 

 minous and valuable work of the great ^Swedish chemist, Berzelius. The 

 first edition of the original work, in the Gorman language, and the French 



