OP ARTS AND SCIENCES. 251 



I. 0.5224 gr. of the salt dried in vacuo gave on ignition 0.0852 gr. 



of ferric oxide. 

 11. .0.3714 gr. gave 0.0612 gr. of ferric oxide. 



Calculated for Found. 



Iron 11.53 11.41 11.53 



Properties. — It forms white pearly scales, which are very sparingly 

 soluble in water, and on exposure to the air turn slightly green, but 

 the amount of the decomposition thus indicated is so small as to be in- 

 appreciable by analysis. 



With mercuric chloride the base gave an uninviting viscous product, 

 while with zincic chloride it formed a characteristic double salt, which 

 separated from concentrated solutions as an oil, but soon solidified in 

 good-sized rhombic crystals ; an analysis of a not perfectly pure sample 

 of this salt led to the following results. 



0.3492 gr. of the salt gave 0.4090 gr. of argentic chloride. 



Calculated for [C7H7(CH3)2NHCl]2ZtiCl2. Found. 



Chlorine 29.65 28.95 



Dibenzyldimethylammonic Chloride, (C.Hj.)2(CH„)2NCl. — This sub- 

 stance was left in the aqueous solution after the benzyldimethylamine 

 had been shaken out with ether, and, when this solution was evapo- 

 rated to one half its original volume, separated as a yellow oil, which 

 solidified as it cooled. It can be freed partially from the inorganic 

 salts present mechanically, or by solution in chloroform, although 

 chloroform does not remove it from its aqueous solution, and puri- 

 fied by washing with a saturated solution of sodic carbonate, and 

 finally dissolving it out of the inorganic impurities with alcohol or 

 chloroform. 



Properties. — It forms white rhombic crystals often in spear-head 

 forms and a centimeter broad, or masses of radiating prisms or needles, 

 but usually separates from its solutions as an oil, which solidifies after 

 standing for some time, more rapidly if touched with a crystal of the 

 substance. It is freely soluble in water, but nearly insoluble in a 

 saturated solution of sodic carbonate, soluble with some difficulty in 

 alcohol, but freely in chloroform, which is the best solvent for it ; it 

 is also soluble in ether, benzol, carbonic disulphide, and glacial acetic 

 acid, insoluble in ligroine. When heated, it gives benzj'lchloride, rec- 

 ognized by its smell and action on the eyes, and a base, which however 

 seems to boil at a higher temperature than the benzyldimethylamine ; 

 but the experiment should be repeated on a larger scale. If the 



