Barium from Strontium by Atnyl Alcohol. 



463 



the nitrates* has demonstrated the possibility of using very 

 much smaller amounts of amyl alcohol in the boiling than the 

 amounts formerly used (30 cm 3 for each treatment). By the 

 use of smaller beakers (50 cm 3 capacity) 10 cm 3 of the 

 alcohol can be conveniently substituted for 30 cm 3 , and the 

 correction for solubility of the strontium nitrate is thus 

 reduced from 0*001 grm. on the oxide to 0*0003 grm. in each 

 treatment, and the corresponding amount of sulphate to be 

 substracted from the calcium sulphate before calculating to the 

 condition of oxide is reduced from 0*0017 grm. to 0*0005 grm. 

 in each treatment. The necessity of a double treatment, or 

 the use of two portions of 10 cm 3 each of the alcohol, brings 

 the total correction to 0*0006 grm. on the strontium oxide, and 

 0*0010 on the calcium as sulphate. For ordinary work such a 

 correction may be disregarded. The following tables give the 

 corrected and uncorrected results. 







Table 



I (correction disregarded). 





SrO taken. 



SrO found. 



Error. 



CaO taken. 



CaO found. 



Error. 





grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



o: 



0*0570 



0-0565 



0*0005 — 



0*0534 



0-0540 



0*0006 + 



(2: 



0*0573 



0*0567 



0*0006 — 



0*0534 



0-0543 



0-0009 + 



(»' 



0*0285 



0*0274 



0*0011 — 



0*0272 



0-0276 



0*0004 + 



(*: 



0*0568 



0-0560 



0*0008 — 



0*0535 



0-0537 



0*0002 + 



(5] 



0-0568 



0-0561 



0-0007 — 



0-0533 



0-0535 



0-0002 + 



(6; 



0*0288 



0-0280 



0*0008 — 



0-0271 



0*0272 



0-0001 + 



rc 



0-1420 



0-1416 



0*0004 — 



0*0535 



0*0544 



0-0009 + 



(8 



0-1419 



0-1416 



0*0003 — 



0-0665 



0*0669 



0-0004 + 



(9, 



0-1135 



0-1132 



0*0003 — 



0-1066 



0*1070 



0*0004 + 



(10' 



0-1137 



0-1126 



0*0011 — 



0-1064 



0*1070 



0-0006 + 







Table II (correction applied). 











SrO found. 







CaO found. 





s 



rO taken. 



(Corrected.) 



Error. 



CaO taken. 



(Corrected.) 



Error. 





grm. 



grm. 



grm. 



grm. 



grm. 



grm. 



a: 



0-0570 



0-0571 



0*0001 + 



0-0534 



0*0536 



0*0002 + 



(2] 



0-0573 



0-0573 



0*0000 



0-0534 



0-0539 



0-0005 + 



(3 



0-0285 



0-0280 



0*0005 — 



0-0272 



0*0272 



o-oooo 



(4 



0-0568 



0-0566 



0*0002 — 



0-0535 



0-0533 



0*0002 — 



(6] 



> 0-0568 



0-0567 



0*0001 — 



0-0533 



0-0531. 



0-0002 — 



(6 



) 0-0288 



0*0286 



0*0002 — 



0-0271 



0-0268 



0-0003 — 



0) 



0-1420 



0-1422 



0*0002 + 



0-0535 



0-0540 



0-0005 + 



(8 



| 0-1419 



0-1422 



0-0003 + 



0-0665 



0-0665 



o-oooo 



(9 



) 0-1135 



0-1138 



0*0003 + 



0*1066 



0-1066 



o-oooo 



(10, 



0-1137 



0*1132 



0*0005 — 



0-1064 



0-1066 



0*0002 + 



* This Journal, xliii, 50. 



Am. Jour. Sci.— -Third Series, Vol. XLIV, No. 264. — December, 1892. 

 31 



