10 Artificial Manures for Swedes. 



c. The portion collected on the first sieve consisted entirely of 

 fragments of limestones, and that of No. 2 nearly altogether of 

 similar but smaller fragments. Both were rejected in preparing 

 a fair average sample for chemical analysis, and the portions from 

 Nos. 3, 4, were powdered in a mortar, passed through the Va inch 

 sieve, and mixed with No. 5. 



Before submitting it to chemical analysis, the average sample 

 was separated. by washing into the following portions: 



100 parts of average soil contained 



Organic matter and water of combination .... 6 339 



Burned deposit after standing 5 minutes .... 69*600 



10 .... 3-880 



15 .... 3 230 



Remaining in suspension after standing longer than 15 



minutes 16-951 



100-000 



The first deposit consisted of a calcareous sand, whilst the 

 second and third were coarse clay, and what remained in sus- 

 pension fine clay. 



The general composition of the soil can therefore be expressed 

 as follows : 



Organic matter and water of combination 6 339 



Clay 24-061 



Calcareous sand 69-600 



100-000 



- 2. Chemical Examination. 



On analysis of the average sample prepared as described above, 

 the following results were obtained : 



100 parts contained 



Organic matter and water of combination .... 6 '339 

 Oxides of iron and alumina, with a trace of phosphoric) Q.QI i 



acid ) 



Carbonate of lime .54-566 



Magnesia trace 



Sulphuric acid ditto 



Chlorine ditto 



Potash and soda . ...... . . . . . 1*032 



Insoluble siliceous matter 28-947 



100-195 



It will be observed that carbonate of lime greatly preponderates 

 in this soil, and that the proportion of alkalies is but small, 

 whilst mere traces of phosphoric and sulphuric acid were found 

 in it. Calcareous soils of such a composition are generally un- 

 productive. 



The experimental field was carefully measured out, and divided 



