128 QUARTERLY JOURNAL. 



1 4. J 100 parts of rough rice, then has 

 17.900 husk. 

 3.909 cotyledon. 

 4.456 epidermis. 

 73.735 clean grain.* 



100.000 



[5. J The ratio of rough rice to the straw of the harvested grain, 

 deduced from taking the mean of fifteen separate experiments, 

 gave the weight of the grain 53.5, that of the straw, including 

 the panicle or stems, 23.6. 



But as many of the leaves appear to have been mutilated, I am 

 disposed to assume as a probable approximation to the truth, the 

 weight of the grain as just double that of the cut straw. And as 

 some observation of the stubble and roots strongly favors the idea 

 of their equaling together the weight of the straw, I shall still 

 farther venture to consider the rough rice of a ripe, harvested plant 

 as equal in weight to that of the entire stem, leaves and root. 



[6.] Let us next attempt an approximation towards an appre- 

 ciation of the mineral constituents of these different portions of the 

 rice plant. 



The ash in 100 parts of rough rice equals .7462 parts. And 

 as the ash in 100 of the husk, equals 13.67, that in 17.90 parts 

 of husk must equal 2.446 parts. By difference, therefore, be- 

 tween 2.446 and 4.752, the ash of the cotyledon, epidermis and 

 clean grain, in 100 parts of rough rice, will equal 2.316 parts. 



But the percentage of the ash in clean rice being known, we are 

 able to state what the amount of ash is. In clean rice of 100 parts 

 rough rice, it is 0.297 parts. The general statement, then, will 

 stand thus, for 100 parts rough rice. 



Ash in the husk, 2 .446 parts. 



" cotyledon and epidermis,.. 2.019 " 

 " cleangrain, 0.297 " 



4.762 

 [7.] The straw, (including the stubble and root,) having been 

 assumed as equal in weight to the rough grain, the ratio of the 

 mineral ingredients of the former to the latter, stands as 12.422 

 to 4.762. 



[8.] Considering a single rice plant, in its dry, mature state, to 

 weigh 100 grains, (a supposition which will often accord with tlie 

 fact,) we shall have of mineral matter in the different parts of the 

 plants, the following number of grains : 



• From losses sustained to the clean grain, in the process of milling, it is not pro- 

 bable that above 70 parts of commercial rice are afforded by lOO of rough rice. 



