296 Notice of some Recent 



cooling, drops subside to the bottom of the vessel, containing 

 much nitro-naphthalase, which is separated by solution in 

 alcohol. The alcohol lets fall crystals. They are four-sided 

 prisms terminated by acute pyramids. Colour sulphur- 

 yellow. Volatile. Insoluble in water ; very soluble in 

 alcohol and ether. Analysis gave carbon 69-86, hydrogen 

 4-07, azote 8-53, oxygen 17-54. 



12. Nitro-naphthalese may be formed by boiling the pre- 

 ceding with nitric acid for a long time. An oily layer 

 appears. The whole is evaporated rapidly. When the oil 

 and acid are nearly equal in quantity, the two layers be- 

 come confused, and if the vessel is removed from the fire, 

 the whole becomes solid which is nitro-naphthalese. It 

 presents the form of microscopical needles. It is neutral, 

 insoluble in water, very little soluble in boiling alcohol. 

 It contains carbon 54-83, hydrogen 2*9, oxygen 29-57, 

 azote 12-7. 



13. Naphthalase. — If we heat nitro-naphthalase with 

 from 8 to 10 times its weight of lime in a small retort filled 

 up to the neck, a brown oil is disengaged containing naph- 

 thaline, ammonia and undecomposed nitro-naphthalase, 

 while a thick oil condenses in the neck of the retort which 

 becomes solid on cooling. The lime is blackened by a de- 

 position of charcoal. The solid matter is washed with 

 ether which takes up the foreign matter. A yellow powder 

 naphthalase remains. Cold sulphuric acid forms with it a 

 fine blue solution. It resembles Idrialine in this property. 

 It consists of carbon 87-, Hydrogen 4*8, oxygen 8*2. # 



III. Compounds of phosphorus and hydrogen. — M.Leverrier 

 finds that when phosphuretted hydrogen is exposed to the 

 action of light, the sides of the glass are speedily covered 

 with a yellow amorphous matter, which may be dried and 

 heated at a temperature of 284°, without either undergo- 

 ing combustion or becoming luminous. It is insoluble in 

 water and alcohol ; chlorine changes it into hydro-chloric 

 acid and chloride of phosphorus ; nitric acid causes it to 

 burn. With solutions of copper, silver, &c. it gives phos- 

 phurets containing more phosphorus than those obtained 

 by the phosphuretted gas. It consists of hydrogen 1623, 

 phosphorus 195 or Hj Ph. It may be also prepared by 



* Ann. de Chim., lix. 196. Jourti. de Chim. Medic, i. 



