14 



Im liitUluii owing l<> tin- iiii.islciiiuj; <>t' llic riet- wliicli tukc8 [.liicv «m ihe Htxxuid 

 (111)- ; in tlic instniux'jnst discuswd llic nitio iK-twi-cn tliu weijjlit of curlion luirnt 

 iiiiil wiiltT coiitiiiiicd liy tliü ki'iji in excess «f tlmt nuitaiiK'd in llic' riw nt Hlurtinj; 

 is vt'iy nearly 12 : 24 or 3 jitimis (ifciirlKin t« 4 nii>lfcnli-s ol' \v.it«T : iin iiMiount 

 111' wjitcr i^niater than lornypomls In tlio f'onDnlu fur (li'xtn>w 



SECTION ;j. 



A( TIVK I'U'lI'KUTIKS f)F KMl 



In tlio |>ri.'|):iiiiti<in of s.ik<> tlio köji ilsdf is iidtlcd to tlic sti-imic«! rice und 

 wiiter, und tlie Folntiun, mixed witli tlie insoluMo residii« of stiircli and ccllnl<KX>, 

 (lien acts upon tlic slcanied rice. To stndy tlii» action more a-iidily it ii« more 

 convenient to make >ise of a (iltercd luineon« extract of küji, for it lias In-en 

 uücertiiincHl that tlio active property of tlie köji, tlie "diiistiwe," Ih ilissolved out 

 liy contact with water. And liint as to the natnrc of thesolntion. A sample of 

 köji when jMiwdcred or ruhhed down in a jtorcelnin nifirtarand then di;;<'8ted with 

 water for a short time '/wi'h, after filtration, a yellow liipiid whiili containn 

 dextrin, dextrose, albnmenoid matter, and a small (piantity of mineral matter 

 The proportions which the three first of tlicisc conslitnents liear tu one anotiier 

 <le]>enil ni)on two things— 1". The qnanlity of water used in pro|)ortion to the 

 köji. 2'. The duration of the digestion, whiL-'t 3'- the tempenitnre at which tlie 

 digestion is effected aflects the amor.iil of the total matter diMolvwl and the 

 rapidity with which it enters into solnlim. The following tahle (p. liül giving 

 the results of exiHMiments made at the ordinary lemperaUire of the air will «how 

 the truth of the first two of these statement.s. 



In column II the volmiie of water used to dissolve (he soliihle matter of 1(JU 

 grams of köji is given; in III, the time during which the water and (he koji 

 remained in contact ; in W, the nnmlier of grair.s of »olid matter diswdviil 

 from lOJ grams of köji liy the anioimt of water metitioi ed ; ctilnmn V givi« tiiu 

 average percentage of solid matter in the exiKTiment« indicated: column VI 

 gives the percentage of dextrose contained in the solid matter; eoliiinn VII. (he 

 s|Kx;itic rotatory power of the solution, ami VIII, the avenigi* K|iecific rotatitry 

 |K)wer of the solutions indicated. In ex|ierimenls 2 to 12 (he amount of water 

 used for 1(X) grams of köji was ]((Wcc. r.nd (hese eN|ieriinen(s include (hni- 

 diifering p'riols of digestion, Imt there is no evidence that llie time of digestion 

 li:i8 much intluence upon the(piautity of matter di^'-dlved. at leiust at (he t)-m- 

 jier.iture lU 15^ C The uvenige jieret iitage of tolid matter di<<Kul\e<l 18 27 (J 

 Kx|>erimen(8 14 to 17 show iiow much solid matter is dissolved when (he amount 

 of water r.seil is 2.'>0'1 c.e. to KM) grjiins of koji; (he a\»'nige i^-nt ndip- U'ini; 

 •>1.4. We s(rc, therefore, that when a larger ipMn(i(y of wa(er is esed the 

 :inioun( of solid ma((er ohtained in toh:(ion isgnadr. I( is no( iiwsiliie (odiaw 



