1 58 Intelligence and Miscellaneous Articles. 



Equivs. 



Carbon 37'82 or 9 = 54 



Hydrogen .... 7-02 or 10 = 10 



Sulphur 11-21 or 1 = 16 



Oxygen 43-95 or 8 = 64 



100- 744 



These crystals appear, however, to contain three equivalents of 

 water, two of which they lose, as well as their form, by exposure to 

 sulphuric acid in vacuo, and also by heat, but the third equivalent is 

 lost only when the acid is combined with bases. 



Anhydrous camphoric acid, as indeed also appears from the con- 

 stitution of the potash salt, must consist of 



Nine equivalents of carbon . . 54 

 Seven . . . hydrogen . 7 



One . . . sulphur . . 16 



Five . . . oxygen . . 40 



Equivalent .... 117 



The properties of crystallized camphoric acid containing the three 

 equivalents of water are, that the form is that of six-sided prisms ; 

 they are colourless, their taste so very acid as to affect the teeth, and 

 extremely soluble in water. If small crystals be thrown on water 

 they dissolve almost instantaneously with rapid motion. The acid 

 containing one equivalent of water dissolves in water with still greater 

 rapidity and motion ; it is very insoluble in common or absolute al- 

 cohol ; soluble in aether, insoluble in cold oil of turpentine, and very 

 slightly dissolved by it when hot, and insoluble id sulphuret of carbon, 

 whether cold or hot. When the crystallized salt is heated on platina 

 it loses its water of crystallization, fuses, and becomes of a red co- 

 lour ; when more strongly heated it blackens, is completely decom- 

 posed, yielding abundant white vapours, and disappearing without 

 leaving any residue. 



Nitric acid dissolves this substance slowly when cold ; when boil- 

 ing it dissolves it rapidly without decomposing it and without evol- 

 ving red vapours ; it is dissolved by cold, and more readily by hot, hy- 

 drochloric acid ; it has been shown by the method of preparation that 

 sulphocamphoric acid is soluble in sulphuric acid moderately heated ; 

 when cold it is but slightly so. When the sulphuric solution is rather 

 strongly heated it assumes at first a red tint, which on raising the 

 temperature becomes gradually black, and when the heat is raised to 

 ebullition the colour becomes of an intense black, the acid is decom- 

 posed, and sulphurous acid is evolved. When put into contact with 

 anhydrous sulphuric acid it loses water, becomes of a blood-red 

 colour and is decomjiosed. 



When chlorine gas is passed into an aqueous solution of sulpho- 

 camphoric acid, an oleaginous compound is formed, which sinks to 

 the bottom of the vessel ; it is insoluble in water, and burns with the 

 green flame, which is characteristic of the presence of chlorine ; bro- 

 mine attacks it with the disengagement of white vapours of hydro- 



