AGRICULTUE,AL MUSEUM. 



OMNIS FEUET OIMNIA TELLUS. VIRG. 



Vol. I.] Georgetown, Ca. March 20. [No. 19.] 



LUCUBRATION ON SOILS JNo. 2 



The second shelf in the alluvial region, which maybe 

 designated by tlie name of the undulating or siliceous re- 

 gion.^ begins at the ridge which forms the upper boun- 

 dary of the flat stoneless region, and extends to the line 

 of tide water. At this boundary ridge, which divides 

 the first and second shelf, the soil begins to be intermixed 

 with a portion of fine gravel, increasing in size and quau- 

 tity as you ascend with the rivers. The surfa e of this 

 second shelf, though in a great measure level, is yet in- 

 tersected with small streams and drains, which have 

 washed gentle declivities and risings. These declivities 

 as you approach the head of tide water, assume more 

 and more the appearance of hills. It is evident on re- 

 flection and examination of this second shelf in the 

 land, that it once was as level as the flat stoneless land, 

 until the springs, streams, drains or gullies, have, in the 

 course of time, washed deeper and deeper, and their 

 banks, which at first were steep, by a like gradual pro- 

 cess, have assumed the appearance of gentle declivities. 

 These declivities and their risings give to this region an 

 undulating surface. The kind of soil that here prevails, 

 abounds in gravel from fine to very coarse or stony, 

 more or less apparent on the surface, according to the 

 complexion and quality, or situation of the land. There 

 are portions of this tract sometimes to a considerable ex- 

 tent, where fine siliceous sand prevails. 



In this region the calcareous substances that are found 

 in masses, are generally mixed with clay or sand. The 

 shell of which they are composed being nearly decayed, 

 and many times altogether so, forming yellow, blue or 



§ Sllcx or siliceous earth i-s often found in a stony farm, sucU as flint or quarti ; and still more 

 frequently in that of a very fine sar.d, such as that whereof flsj} 19 mfids. It doe« not e£fi;rv«»t«^ 

 (i^r ii it eolublo ifi »oy vS tb; (oumua acidt, 



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