a porcelain basin of about 200 c.c. capacity, and removing the loosened foil and broken composition by means of a pointed wooden chip.  Composition adhering to the shell or foil is loosened by alcohol, and washed into the dish by means of alcohol in a small wash bottle.  The shell and foil are put to one side and subsequently weighed when dry.  The composition in the dish is broken down quite fine with a flat-headed glass rod, and the alcohol evaporated on the water bath till the residue is moist, but not quite dry, 25 c.c. of water are then added, and the composition well stirred from the bottom.  After the addition of 0.5 grm. of pure sodium, thiosulphate, the contents of the dish, is well stirred for two and a half minutes.  One drop of methyl orange is then added, and the solution titrated with N/20 sulphuric acid, which has been standardised against weighings of 0.05-0.1 grm. fulminate to which 25 c.c. of water is added in a porcelain dish, then 0.5 grm. of thiosulphate, and after stirring for two and a half minutes, titrated with N/20 sulphuric acid.  The small amount of antimony sulphide present does not interfere with the recognition of the end point.  After titration, the solution is filtered through a small 5-1/2 cm. filter paper, which retains the antimony sulphide.  The filter paper containing the Sb_{2}S_{3} is well washed and then transferred to a large 6 by 1 test tube.  Five c.c. of strong hydrochloric acid are added, and the contents of the tube boiled gently for a few seconds until the sulphide is dissolved and all the H_{2}S driven off or decomposed:  2-3 c.c. of a saturated solution of tartaric acid are added, and the contents of the tube washed into a 250 c.c.  Erlenmeyer flask.  The solution is then nearly neutralised with sodium carbonate, excess of bi-carbonate added, and after the addition of some starch solution titrated with N/20 iodine solution.  This method for small quantities of stibnite is both quick and accurate, the error being about +-0.0003 grm.  Sb_{2}S_{3} at the outside.

The tendency of this method is to give slightly low figures for the fulminate, but since these are uniform within a negligible error, it does not affect the value of the results as a criterion of uniformity.  The following test results were obtained by Dr Brownsdon:—­

_______________________________________________________

_____
|                    |                   |                   |
|  Fulminate Taken.  |  Fulminate Found. |      Error.       |
|        Grm.        |       Grm.        |       Grm.        |
|                    |                   |                   |
|       0.0086       |      0.0083       |     -0.0003       |
|       0.0082       |      0.0081       |     -0.0001       |
|       0.0074       |      0.0071       |     -0.0003       |
|       0.0068       |      0.0066       |     -0.0002       |
|____________________|___________________|__________________

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|                    |                   |                   |