True and Hunkel, The Poisonous Effect Exerted etc. 363 



Table XXIII. 



Para-cresol -f 1 Na OH. 

 Begun Feb. l6, 2:25 P. M. 



(?)■ 



Table XXIV. 

 Electrieal Conductivity of Paracresol (Bader). 



V. /iiY 100 k. 



14,4 0,14 0,0000011 



28,8 0,28 0,0000011 



57,6 0,30 0,0000012 



115,2 0,48 0,0000016 



fioo = 356. K = 0,0000011. 



As will be seen in the preceding tables of electrieal conduc- 

 tivity, Bader was able to give a constant for the cresols. From 

 bis results, it appears that the ortho Compound is more dissociated 

 than the meta form, and this again more than the para isomer. 

 The results observed in working with the lupines presented in 

 the preceding tables indicate that a greater toxic activity is pos- 

 sessed by the para-cresol than by its isomers. It seems probable, 

 however, that the difference in dissociation does not account for 

 the diiFerence in toxic activity seen. 



This agrees in a general way with an Observation by 

 Kahlenberg and True^) on the ortho-, meta- and paranitro- 

 benzoic acids. The boundary-concentrations determined for lupines 

 were 1/6400, 1/12800 and 1/12800 rcspectively ; the degree of 

 dissociation at a dilution of 1/1024 for these acids was 87,9 per 

 Cent, 44,4 per cent and 46,4 per cent respectively. Unpublished 

 results by the same authors on the toxic activity of the sodiuni 

 salts of these acids show the same toxic value, 1/400, for all 

 three isomers. 



Tables XVII, XX and XXIII preseni the results observed 

 on adding Na OH to the cresols. The poisonous effect is some- 

 what diminished in all except para-cresol, the Situation here 

 being unchanged. 



Filaments of Spirogyra placcd in a Solution of ortho-cresol 

 containing 1/400 gram-molecule per liter, were found after twenty- 



1) Kahlenberg and True, Bot. Gaz. XXII. p. 122. 



