96 HANDBOOK FOR BIO-CHEMICAL LABORATORY. 



effected by drawing a current of air through the fluid in 

 which the turnings are immersed. Cellulose is soluble in the 

 above reagent. 



SEIDEL'S Reaction (Inosit). Evaporate a small amount of 

 the substance to dryness in a platinum crucible with a little 

 nitric acid (sp. gr. 1.1-1.2), and treat the residue with ammo- 

 nia and a few drops of a solution of strontium acetate, lu 

 the presence of inosit a greenish coloration is observed, to- 

 gether with a violet precipitate. 



SKATOL. See Ciamician and Magnanim. 



SMITH'S Reaction (Bile Pigments). Pour carefully over 

 the liquid to be tested tincture of iodine, whereby a green 

 ring appears between the two liquids. 



SoLDAsri's Solution (Glucose). Dissolve 15 grms. copper 

 carbonate in 1400 c.c. water and add 416 grms. potassium 

 bicarbonate. On heating a glucose solution with the above 

 solution a reduction of copper suboxide is obtained. 



SPIEGLER'S Test (Albumin). Remove mucin from the 

 solution by the addition of acetic acid, filter, and treat the 

 filtrate with a solution prepared by dissolving 8 grms. mer- 

 curic chloride, 4 grms. tartaric acid, in 200 c.c. water and 

 adding 20 grms. glycerin thereto. In the presence of albumin 

 a white ring is obtained between the two liquids. 



STOKVIS'S Test (Bile Pigments). Treat 20-30 c.c. of urine 

 with 5-10 c.c. of a solution of zinc acetate (1 to 5). The pre- 

 cipitate is washed on a small filter with water and then dis- 

 solved in a little ammonia. Filter, and the filtrate gives, 

 after standing in the air, a peculiar brownish-green color, and 

 shows the three absorption-bands of bilicyanin, the first between 

 C and D, the second at Z>, and the third between D and E, 



