CHKMICAL BASIS < U THK ANIMAL lnl>Y. 



The probability that it is as dextrose that tin- carl > 'hydrates are 

 finally ahs.'H'cd from the alimentary canal ha> all- 



i to p. .".'.. This c.inv>p,,mU \\ith tin- t'ai-t that 

 is tin- most ivadily assimilable i-.m compara- 



tive injections of tin- various sugars int<> the hhtod-vessels ami 

 rvations on their subsequent appearance in the urii 



When pa iv. dextrose is colourless and crystallises from it- 

 aqueous s.>luti"ii in six-sided tables or prisms, often agglcum 

 int-) warty lumps. The crystals will dissolve in tln-ir own weight 

 of cold watvr. requiring however some time for tin- process; they 

 ivadily soluble in hot water. I.-\trose is somewhat 

 sparingly soluble in cold ethyl-alcohol, more soluble in warm; 

 slowly soluble, hut in considerable quantity, in in-thyl-al-ohol, 

 and insoluble in ether. 



It may l.e prepared by eom-rntratin.i: dial.eti- urine until it 

 Yields crystals of <l-xtro>r: these are then purified li\ i..i\-t,il- 

 lisaticn fr.im methyl-alcohol. It may al-o In- eonvcniently \<\-<-- 

 par.'d l>y thi- action of hydrochloric acid on canr-M. 'l\vd 



in alcohol. 1 A freshly prepared cold aqueous solution of de\ 

 possesses a specific rotatory powvr for monochromatic y.-llcw 

 Qght "f (a) : , =-f~100- This rapidly falls, especially on \varm- 

 in.i:. until it may \>e taken as (a),, =-f-52'5 for solutions which 

 do not contain more than 10 p.c. of the sugar. The rotation is 

 however dependent on the concentration of the solution being 

 with very dilute solutions. 



Tin- s|..cilic r.'!:it..rv |>u-r \ a >ultaiic.- i- tin- unmuiit. 

 in ili'-jri-i--. l-v wliii-li tin- plain- >f pnlari-il lij^lit is rntatdi by a solu- 

 \\lii.-h i-.uitaiii> 1 ^rain "f tin- >nli>tanr- in each 1 c.c. \\li- 

 in a la\i-r 1 ilcin. in tlii- >inrc tin- atinniiit .f r^ 1 



in any 'jivi-ii case 18 ilin-i-tly pr<'p.-rl imial t-- tin- >: 



. al-' t.i tin- -ij:lit .if Mil-tan.-.- in .siiluti.ui ami tin- 

 .f tin- tiiii.l lay.-r in uliidi it i* examined we have 



(a) = -' . \\ln-n- (.1) i- tin- .-p.-.-il 



power. /- i- tli.- u.'i^ht in -nun- ! tli.- -ill-tan.-.- in 1 .-..-. ..f t)n> solu- 

 ti-.M. / is tin- thickneM in <l.-.-i: tin- tlni.l lay.-rai 



.,|,-,r\'d rotation. Tlii- ..|ii:iti"ii pm\ i.l<- a m.-ans of < 



- <|uantitati\''ly \>\ im-asiirinjr tin- rotation | i solu* 



.f unknown .-.-n.-.-nt ral in in a l.i\.-r of known t liirkin--s. tin- 

 \ pou.-r IM-JIIL; kno\\ n.- 



I for nn'asiirinj: tin- amount >f r.-r 



pro.iii.-.-.l l-\ an ojiti.-allx a.-ti\r -ill. -t. inc.- .ir.- kiioi .llyas 



li^'lit 

 rhtly luminous so.liiiin-tlain.'. tin- .l.-t.-rn 



iN I !(.| XM [IMfl 



rmtruroi>ntji anil tncthixU urc l.nnl.ilt. /fat opliickr 



:* organ. > JI"p| v - '. fxilk. rftrm. .l.i/. 1883, 8. 



...trunKai. -n IMO. p. SWH Mq. 



