OF ARTS AND SCIENCES. 



115 



means they are deprived of nearly all their highly poisonous juice. As 

 the active principle of this juice is volatile, it is entirely dissipated by 

 baking the pulp upon iron plates. The pulp thus prepared is hard 

 and friable, and is easily broken into lumps, which are laid in the sun 

 to dry. la this state it is known by the name of cassava. It is puri- 

 fied by being stirred up with water and filtered through linen ; the 

 liquid is then boiled down over a fire, being constantly kept in agita- 

 tion. As the water evaporates the starch thickens, and finally be- 

 comes granulated, when it must be dried over a stove. A toler- 

 ably good imitation of it is made by treating potato-starch in a similar 

 manner. 



I. 1.0577 grm. lost at 100° C. 0.1409 grm. 

 II. 1.383 grm. dried at 100° C. left 0.0016 grm. ash. 



III. 3.8196 grm. dried at 100° C. left 0.0048 grm. ash. 



IV. 0.3669 grm. gave 0.5896 grm. CO2 and 0.214 grm. HO. 



V. 0.3611 grm. gave 0.5774 grm. CO^ and 0.2118 grm. HO. 



VI. 2.3044 grm. gave 0.041 grm. NH^Cl. PtCL. 



Corresponding in 100 parts to 



Carbon 



Hydrogen 



Nitrogen 



Ash 



Water 



I. 



43.79 

 6.48 

 O.IO 

 0.12 



13.32 



II. 

 43.61 

 6.51 



0.12 



Average. 



43.70 

 6.49 

 0.10 

 0.12 



13.32 



Estimated in 100 parts, we obtain the following numbers : 



^ Nitrogen 

 I Carbon 

 Nitrogenous constituents, •{ Hydrogen 



Oxygen 

 (_ Sulphur 



{Carbon 

 Hydrogen 

 Oxygen 



Water not expelled at 100° C. | J^y^^'oge" 

 ^ ( Oxygen 



Ash 



0.10 

 0.34 

 0.04 

 0.13 

 0.01 



43.36 



6.02 



48.19 



0.43 

 3.44 



0.62 



97.57 



3.87 

 0.12 



102.18 



