OF ARTS AND SCIENCES. 323 



ranged in radiating groups, although occasionally forms with two 

 comb edges were observed. If crystallized from alcohol alone, in 

 addition to the thick needles or prisms, other rather broad prismatic 

 forms are observed, which have a notch in each end so that they 

 resemble reels, or, wdien this formation is carried farther so that the 

 notch has a flat bottom, crystals resembling spools are produced. 

 Both these latter forms are very characteristic. It melts at 147- 

 148° ; and is very freely soluble in ethyl or methyl alcohol even 

 in the cold, in ether, acetone, or glacial acetic acid; freely soluble 

 in benzol or chloroform; soluble in carbonic disulphide; nearly 

 insoluble in ligroine; water dissolves it to a certain extent when 

 cold, still more, although not freely, when hot. The three strong 

 acids have no apparent action on it. Alkalies form yellow salts 

 with it. 



Potassic Dibromdinitrophenylate, C 6 HBr 2 OK(X0 2 ) 2 - — This salt 

 was prepared by heating the free phenol with an aqueous solution 

 of potassic carbonate, and was purified by crystallization from 

 hot water. The salt was found to be free from water of crys- 

 tallization. 0.1806 gr. of the air-dried salt lost only 0.0005 gr. at 

 120°. Garzino found one half of one molecule of water in his 

 potassic dibromdinitrophenylate. The salt dried at 120° gave the 

 following result on analysis : — 



0.1664 gr. of the salt gave 0.0390 gr. of potassic sulphate. 



Calculated for C 6 HBr 2 OK(NO,), Found. 



Potassium 10.29 10.52 



The salt crystallizes from hot water in arborescent clusters of 

 orange-yellow needles, which are somewhat soluble in alcohol, but 

 not freely even when it is hot. 



Baric Dibromdinitrophenylate, [C 6 HBr 2 0(X0 2 ) 2 ] 2 Ba2H 2 0. — The 

 salt was made by boiling the phenol with water and baric carbonate, 

 and purified by crystallization from boiling water, when it was 

 analyzed with the following results: — 



I. 0.2834 gr. of the salt dried in the air lost 0.0116 gr. at 120°. 

 II. 0.2834 gr. of the air-dried salt lost 0.0135 gr. at 120°. 

 III. 0.2831 gr. of the air-dried salt lost 0.0121 gr. at 120°. 



Wat 



or 



