392 True and Huukel, The Poisouous Effect Exerted etc. 



Tri n Itrop hcn Ol (Picric Acid) Cg1I2 (011) (NO2) (NO2) 

 (NO2) = 1:2:4:6. 



10. 



15,0 „ 



16,5 „ 



15,5 „ 

 1/800 15,5 „ 



16,U „ 



15,5 „ 



17,0 „ 

 1/1600 15,5 „ 



14,5 ,, — 



19,5 ., 30,0 „ Alive. 



16,0 „ 24,0 „ 



Picric acid, trinitro))henol, coiitains tlirec NO2 groups, aud 

 sliould tlie multiplication of these groups iucrease tlie toxic aetioii 

 in Proportion, this Compound should be decidedly more poisonous 

 than the mono-nitrophenols. A comparison of Tables XXIX, 

 XXXII and XXXVI shows tbat this is not the case. 



Ostwald') has shown that trinitrophenol behaves rauch 

 like the streng acids. kSolutions of one gram-molecule in 1024 

 liters are almost completely dissociated, and Ave should expect it 

 to follow the rule of these substances. According to Table XXXVI, 

 we see that it behaves toward lupines in a manner similar to that 

 of a completely dissociated monobasic acid. ^) Its toxic value 

 agrees with that found for HCl and HNO3, r6400. The toxic 

 action appears, howevcr, to be due in part only to H ions, the 

 anion seeming also to possess poisonous properties. This appears 

 on comparing the toxic value of the acid with that of its sodium 

 Compound. The toxic action of the anion is seen by comparing 

 the concentrations of sodium picrate and sodium chloride first 

 alloAving growth. The toxic value of sodium picrate is 1/800, 



^) Ostwald, Joiirii. fiii- prakt. Chemie. XXXII. p. 354. 

 ^) Kahlen borg and True, Bot. Gaz. XXII. p. 92. 



