294 Notice of some Recent 



composed, and a portion passes over with an oil. By ex- 

 pressing- the product between paper we obtain a pure sub- 

 stance which crystallizes by means of alcohol in needles 

 with a rhomboidal base. It is isomorphous with the 

 preceding. 



If this pyrogenous compound is treated with a current 

 of dry chlorine at the usual temperature, the gas combines 

 with it and forms a solid, which, when dissolved in ether, 

 crystallizes in small prisms. It is colourless, insoluble in 

 water, little soluble in alcohol, more so in ether. It may 

 be distilled. It consists of carbon 25*4, hydrogen 1*2, 

 chlorine 73 - 4. 



5. Chloro-naphthalose. — When naphthaline is submitted 

 to the action of chlorine it liquifies, and muriatic gas is 

 evolved. The matter becomes solid. By applying heat 

 and continuing the action, a crystalline mass is obtained, 

 which may be purified by dissolving it several times in 

 alcohol or ether. The crystals are oblique prisms. Chloro- 

 naphthalose is white and insipid. It distils without change. 

 Burns with a green flame. At a red heat, lime converts it 

 into chloride of calcium and carbon. It consists of carbon 

 45-6, hydrogen 1-5, chlorine 52*9. 



6. Hydro-chlorate of chloro-naphthalase. — This compound 

 is produced by first passing a current of chlorine over naph- 

 thaline ; this process should be stopped when the only pro- 

 duct, which was heated during the re-action, begins to de- 

 posit a white matter. This oil is a mixture of naphthaline, 

 oily chloride, and solid chloride. When exposed to a tem- 

 perature between 122° and 140° in a small capsule, then 

 dissolved in ether and exposed to a cold of 14°, the greater 

 part of the solid chloride is deposited. The ethereal solu- 

 tion when mixed with alcohol and exposed to the air de- 

 posits f-ths of oil. The remainder, when exposed to a heat 

 sufficient to expel the ether and alcohol, is pure hydro- 

 chlorate of chloro-naphthalase. It is only, slightly yellow, 

 soluble in alcohol and ether. Chlorine converts it into 

 hydro-chlorate of chloro-naphthalese. It is decomposed by 

 potassium, and partially by distillation. Its constituents 

 are carbon 61-435, hydrogen 3-525, chlorine 35-040. 



7. Hydro-chlorate of chloro-naphthalese or solid chloride is 

 obtained by the process just described. After the action of 



