Drumm — The Constitution of Catechm : Part I. 49 



what sparingly soluble in cold, though readily soluble in hot absolute 

 alcohol. The base does not give any colouration wiih ferric chloride, and is 

 insoluble in cold caustic potash solution. It dissolves in concentrated 

 sulphuric acid, giving an orange-coloured solution which does not exhibit 

 any fluorescence. 

 On analysis : — 



0-1728 grams of the substance gave 04270 grams of COg and 0-1020 



grams of HjO, corresponding to 67-36, H 6-61. 

 0-1424 grams of the substance gave 0-3530 grams of CO, and 0-0824 



grams of HjO, corresponding to C 67"6, H 6-46. 

 CaiHaiOg requires C 67-70, H 6-50. 

 CigHjoOg requires C 66-25, H 5-85. 



Preparation of the anhi/drohydrocMoride of the colour base. 



Two grams of the base were dissolved in 20 c.c. of chloroform, 50 c.c. of 

 chloroform, previously saturated with hydrogen chloride, were then added to 

 the solution, and the whole allowed to stand in a shallow evaporation dish. 

 After a few hours the separation of a carmine-red crystalline solid from the 

 solution was complete. The crystals were separated on a Buchner funnel, 

 and washed once with 10 c.c. of chloroform. The chloride was then dried for 

 ten minutes at a temperature of 75-80" C. in an air oven, and, finally, it was 

 allowed to stand for two days over powdered caustic soda in a vacuum 

 desiccator. The yield of pure substance was 2 grams. It melted at 

 126-1:^8- C. 



The chloride is only sparingly soluble in the ordinary solvents. When 

 alcohol is poured on the crystals the red colour quickly disappears, indicating 

 alcoholysis of the salt to the base. Excess of hydrochloric acid restores the 

 red colour. The chloride is somewhat soluble in hot dilute hydrochloric acid, 

 forming a coloured solution which possesses feeble dyeing properties. 



In an estimation of chlorine in the compound by the method of Stepanow : — 

 0-4340 grams of the chloride required 12-35 c.c. of N/10 AgXOj, 



corresponding to chlorine 10-09 for the compound. 

 CjgHjgOgCl requires chlorine 9-78. 



In conclusion, the author wishes to express his thanks to Professor 

 H. Eyan, d.sc, for his valuable advice and helpful criticisms, and to the 

 Department of Education of An Saorstait for a grant in aid of the investiga- 

 tion. 



TJniveesity College, Dublin, 

 May, 1923. 



K.I.A. PROC, VOL. XXXVI, SECT. B. [-^j 



