51 



99.62 

 This will be found without doubt a valuable fertilizer — it con- 

 tains almost half the amount of potash which the green sands of 

 New Jersey do, that are so remarkable for giving fertility to the 

 exhausted soil of that State. 



Another specimen of marl, from Hinds Co., Ms. gave the fol- 

 lowing result: — 



Vegetable matter, 68 



Silex, 12.20 



Peroxide of iron and alumina, 3.40 



Carbonate of lime, 82.62 



Magnesia, 1.20 



100.10 



Analysis of No. 5 — color, greenish, compact. It contained 

 water 3.20 per cent, and of organic matter, 3.60. 



Analysis of 50 grains of the dry ignited powder. 

 Silicates, 27.00 



Carbonate of lime, 7.30 



Peroxide of iron and alumina, 13.03 

 Magnesia, 2.75 



50.08 



This marl was examined for potash, but without success. 



The following remarks were made of the soils in the letter 

 accompanying the specimens. No. 1 is the black surface earth 

 of the prairie. No. 4 below No. 1. It is a fine grain and chalky 



