198 BACTERIAL POISONS. 



ill-defi&ed conditions, especially when no glycocoll was 

 present, a basic product which gave, with sulphuric acid, 

 large lamellar crystals. The free base forms a thick color- 

 less syrup, possessing a nauseous, bitter taste. It did not 

 become crystalline even after standing some time. Unlike 

 the base C 8 H U N, it is not volatile, and is, therefore, obtained 

 on evaporation of the acidulated solution after previous 

 removal of the volatile bases by distillation with baryta. 



A BASE, C 8 H n N, isomer of collidine and of the preceding 

 base, with which it is possibly identical, was obtained by O. 

 DE CONINCK (1888) in the later stages of putrefaction of 

 sea-polyps (poulpes marine). It forms a yellowish, rather 

 mobile liquid, possessing a strong benumbing (vireuse) odor, 

 and is but slightly soluble in water. It is soluble in methyl 

 and ethyl alcohol, ether and acetone. Its density is 0.9865. 

 When dried over potash it boils at 202 without undergoing 

 decomposition. On exposure to the air it becomes brown, 

 hydrates rapidly, and the boiling-point is then lowered. It 

 has not been noticed to absorb carbonic acid from the air. 

 It resembles some of the bases obtained from Dippel's oil. 

 The salts are in general less stable than those of the pyri- 

 dine bases, and in this respect it approaches the dihydro- 

 pyridine bases. 



The HYDROCHLORIDE, C 8 H U N.HC1, forms white or 

 slightly yellowish radiate masses which are deliquescent 

 and very soluble in water. The hydrobromide, C 8 H n N. 

 HBr, resembles it, but is less deliquescent and a trifle less 

 soluble in cold water. 



The PLATiNOCHLORiDE,(C 8 H u KHCl) 2 PtCl 4 , is a dark 

 orange-colored powder, which is insoluble, or almost so, in 

 cold water, and is a rather stable compound. Boiling 

 water and water at 80 decompose it into hydrochloric 

 acid and (C 8 H,,NCl) 2 PtCl 2 , which is a light-brown powder, 

 insoluble in cold, scarcely so in hot water. 



The AUROCHLORIDE, C 8 H n N.HCl.AuCl v forms a light 

 yellow precipitate. It is quite stable in cold, but very un- 

 stable in hot or even warm water. It cannot be modified 

 by withdrawal of hydrochloric acid. 



