S64 Intelligence and Miscellaneous Articles. 



resembles the double chloride of ammonium and platina. When the 

 solutions are mixed hot, it precipitates on the cooling of the mix- 

 ture, and forms small transparent yellowish- red mammillated masses. 

 This salt also seems to be modified when it is redissolved, and ap- 

 pears to contain ammonia. When it is boiled with barytes water, 

 the base is decomposed and platina black is formed. 



The author gives the following as the composition of cotarnina, 

 reserving, however, a correction which may be required, as he was 

 not quite sure that the substance was absolutely pure. 

 The platina salt gave, — 



I. II. Equivalents. Calculation. 



Chlorine .. 24-07 3 24-7 



Carbon 35-04 34-35 26 36-3 



Hydrogen . . 320 3-46 14 32 



Azote 4-44 1 3-3 



Oxygen 10-26 5 Q-Q 



Platina 22-97 2264 1 22-9 



99-98 100- 



The mercurial salt yielded- 



Chlorine . , . 



Azote 



Carbon . , . 

 Hydrogen . 

 Oxygen . . . 

 Mercury 



Experiment. Equivalents. Calculation. 



20-68 3 19-9 



2-52 1 2-6 



26 



14 



5 



37-95 2 



The composition of cotarnina will then be = C^" H'^ NO* ; 

 The composition of the double salt of platina = Pt Cl'^+HCl-f co- 

 tarnina ; 



The composition of the double salt of mercury = 2HgCl + H CI -f 



cotarnina. 



The latter contains therefore one equivalent more metallic chloride 

 than the former. — Ann. de Ch. et de Phys., October 1844. 



ON APOPHYLLENIC ACID. BY M. WOHLER. 



The author has been unable to produce this substance with cer- 

 tainty, and he has not obtained sufficient to determine its composi- 

 tion ; but some of its properties are so characteristic, that he does 

 not hesitate to consider it as a peculiar substance, and to bestow a 

 name upon it. 



It contains azote ; it crystallizes in two different forms, when an- 

 hydrous and when hydrated ; when it contains water of crystalliza- 

 tion, it forms much-elongated octahedrons with a rhombic base, 

 which cleave very readily parallel to their base, the cleavage face 

 having a pearly lustre, exactly like the crystals of apophyllite, whence 

 the name given to this acid. They readily lose their water, but pre- 

 serve their form and become opake ; this happens below 212°, and. 

 the loss amounts to 9 per cent. 



