of organic constituents of soils. 



Insoluble in cold 

 alcohol. Saponify 



Soluble in pe- 

 troleum ether - 



8 



10 



Petroleum ether Solution contains 



Residue contains. 



Soluble in cold 

 alco 

 täte 

 täte 



f Hentriacontane 



Agrosterol 



Phytosterol 



a-Mono-hydroxy 

 stearic acid 



Lignoceric acid 



fT^''°\u Sr^'^P'"!! fPrecipitate contains Paraffinic acid 



täte with Pb ace- ^ 



12 



Insoluble in petroleum ether. 



Filtrate contains Liquid glycerides 



rResin acids 

 1^ Resin esters 



r«-< 



17 



. Di-hydroxy stearic 

 acid 



Precipitate 

 (reject) 



Filtrate. Make 

 alkaline with 

 ammonia 



i8 



Precipitate decom- " 

 posed with HjS; 

 add alcohol 



, Filtrate (reject) 



20 



' Precipitate contains Pentosans 



Filtrate contains Pentose sugars 



22 r Precipitate contains Picoline carboxylic 



acid 



23 



24 



Filtrate. Make 

 alkaline with 

 ammonia ^ 



' Precipitate contains Cs'tosine 



. Filtrate (reject) 



28 



27 



26 rPrecipitate .. 

 Decompose with 

 H.S 



Filtrate. Add am- 

 moniacal silver 

 nitrate 



Precipitate (re- 

 ject) 



29 

 ' Precipitate. 

 Treat with HNO3 i 

 30 



Filtrate (reject) 



' Precipitate 



contains. . .Xanthine 



Filtrate 

 contains. . . Hypoxanthine 



36 



Filtrate (re- 

 . ject) 



'Filtrate (re- 

 ject) 



.Precipitate contains Arginine 



Histidine 



219 



