360 Mr. George Henry Jaclisoa, 



Of Water of crystallization, O 9 = 23 equivalents. 

 ,, Cyanuret of barium, 081 = 2 equivalents. 



,, Bi-cyanuret of mercury, 3*14= 3 equivalents. 

 Loss, . . 0*15 



5-00 



The equivalent of this salt (in crystals) is 1161*52. Its 

 composition may be expressed in symbols by 3 (Hg + Cy 2 ) 

 x 2 (Ba x Cy). 100 grains of water dissolve 17 grains of 

 this salt; the solution, if added to a salt of lead, gives a 

 white precipitate completely soluble in an excess of the preci- 

 pitant ; if added to a salt of copper, it produces, at first, a 

 yellowish green precipitate, but, on the addition of an 

 excess of the precipitant, the precipitate becomes white ; 

 with a solution of tartar emetic, it gives a white pre- 

 cipitate ; with a solution of chloride of manganese, a white 

 precipitate at first falls, which, however, very soon turns 

 brown from the absorption of oxygen from the atmosphere ; 

 when added to a solution of sulphate of zinc, a white preci- 

 pitate falls ; with a proto-salt of iron, an orange-coloured 

 precipitate takes place, which soon changes into Prussian 

 blue, from the absorption of oxygen from the air ; no pre- 

 cipitate takes place with arsenious acid. 



This salt, is dissolved slightly by alcohol. If a slight 

 quantity of this salt be heated on a piece of platinum foil 

 in the spirit lamp, it is at first decomposed, but directly 

 after the decomposition has taken place, the edge of the 

 platinum foil is surrounded with a brilliant emerald green 

 light, owing to the phosjmorescence of the baryta. 



This salt loses just half its water of crystallization before 

 it begins to be decomposed. 



IV. Hydrargyro-cyanuret of strontium crystallizes from the 

 mixed solutions of bi-cyanuret of mercury and cyanuret of 

 strontium, in colourless transparent four-sided prisms. 



10 grains (in crystals) of this salt were heated in a tube 

 connected with another weighed tube filled with fragments 

 of chloride of calcium ; the difference between the weight 

 of the tube before and after the experiment was 0*04 grs. 

 This salt, therefore, contains no water of crystallization, 

 but water mechanically mixed with it; when heated, the 

 crystals decrepitate strongly. 



