amount, namely, that they are laborious and take much time. 

 By extraction with a suitable solvent, such as alcohol — in 

 which the amylum of the kernel is not soluble while this 

 is indeed the case with the greater part of the above named 

 specific substances of the silver-skin — it might be just as 

 possible to demonstrate quantitatively the difference between 

 kernel and skin, but much more easily. Possibly also this 

 would even give more definite results, for according to this 

 method a whole complex of substances could serve as indicator, 

 and not only a single one. The experiment might be made 

 still more sensitive and the results still more accentuated 

 by applying the spirit-proof, not to the test-material reduced 

 to powder, but to the whole grain, by which means only 

 the outer layers of the silver-skin or perhaps of the kernel 

 would come into contact with the solvent. 



All these considerations led finally to the following manner 

 of testing. 



A certain quantity, for instance 25 gram of whole (unbroken) 

 grains — which were for all certainty gently rubbed in order 

 to remove powder which might have remained clinging to 

 them — were chosen from an average sample of one or other 

 of the kinds of rice which were to be investigated, and 

 then together with the same quantity (25 ccra.) of strong 

 spirit (spirit of 95%) were heated just to the boiling point 

 of spirit in a water bath. To prevent evaporation hereby, 

 this is best done in an Erlemeyer flask with a reflux tube. 

 After the spirit has boiled a very little time it inUst cool 

 down either of itself or by artificial means; more or less 

 shaking of the content of the flask during this process has 

 proved to have no practical influence on the result. When 

 quite cold, the tincture obtained is filtered into a measuring 

 glass through a small filter (with a radius of about 4'/ 2 cm.). 

 The liquid which has passed through the filter — with 

 unpolished rice this measures generally 21 ccm. and with 

 polished rice 22 ccm. — or else a certain portion of this 

 filtrate, is afterwards evaporated above the water bath on 



