169 



(e) Two grams of sample on sand in water-jacketed oven for six hours on one day 

 and four hours the following day. Weigh at end of the ten hours. Then heat for two- 

 hour intervals until constant weight is attained. 



), but do not use sand. 



Uy rrira. n.in.-i.-r. The procedure is the same as for any work with the refrac- 

 tometer. The readings an- laken at 28 C. or any other temperature. A few drops 

 of the solution are placed on the prism and the border line adjusted and read as per 

 in-t ructions I'nimd m Bulletin 107, page 132. The per cent of water is obtained from 

 table of Geerligs herewith. A table of temperature corrections is also given, so that 

 corrections can be made for any other temperature. 



V7*'* table for dry substance in sugar-house products by the Abbe refractometer, at 



* Find in the tabl- th- r-fnu-tiv index which is next lower than the reading actually made and note the 

 :,.n.linK whol.- iiiim*T for th> IMT cent of dry substance. Subtract the refractive index obtained 

 from to UiM.* from th.- obs.Tv.-d n-adiriK; tlw decimal corresponding to this difference, as given m the 

 column so marked, is added to the whole per cent of dry substance as first obtained. 



