CREOLINES. 



361 



of a mixture of higher phenols and coal-tar oil containing a small quan- 

 tity of pyridine bases. 



Artmanns " Creoline". — Contains hydrocarbides extracted from 

 coal tar and completely freed from phenols, German patent 51515. 

 Whilst Pearson's " creoline " contains, along with 57-60 per cent of 

 hydrocarbides, 22-27 per cent of phenols, Artmann's "creoline" con- 

 tains 85 per cent of hydrocarbides, and only 1-5 per cent of phenols. 



Properties. — " Creolines " treated by water yield an emulsion from 

 which the hydrocarbides present therein separate after a certain time. 

 Compared with lysols they have the great drawback of not yielding 

 stable solutions with water. Looking to their different phenol content 

 their action is very variable. 



Action on Plants. — Fleischer tested the action of Artmann's 

 "creoline " on plants and prepared the following table: — 



TABLE LXXVII. — Skoiving the Action of Artynann's '^ Creoline'' 07i Plants. 



Action on Insects. — Fleischer tried Artmann's " creoline " on 

 plant lice : — 



TABLE h\.\Nlll.— Action of Artmann's ''Creoline" on Plant Lice. 



Goethe found a solution of soft soap better than one of " creoline ". 



Use. — Disinfection of Seed Potatoes. — Mohr tried to disinfect 

 seed potatoes with " creoline ". By steeping twenty hours in a 0-2 per 

 cent of " creoline " their germination was retarded ten days. A more 

 concentrated solution had deadly effects. By diminishing the dose to 

 0'05 per cent and in adding 1 per cent of blue vitriol, not only was the 

 germination not retarded, but the crop was heavier, say 35"2 metric 

 tons with 13'9 per cent of starch against 21 6 metric tons with 17 per 

 cent of starch. 



