252 PROCEEDINGS OP THE AMERICAN ACADEMY 



attempt to make out the relative acidity of the three nitrophenols by 

 treating weighed amounts of baric carbonate with solutions of the 

 corresponding quantity of the three isomeres, and after one week 

 determining the amount of baric carbonate dissolved. In this way 

 they got results which calculated in percentages of the amount from 

 the para compound become : — 



Paxa. m.pt. 115°. Meta. m.pt. 96°. Ortho. m.pt. 45°. 



100 57 93 



and, therefore, agree with mine neither in order nor ratio. 



ELEVENTH PAPER. 



As the preceding paper has brought the first part of these researches 

 to a conclusion, I have thought it best to give in the present paper 

 certain corrections and additions which will leave this division of the 

 subject in a more satisfactory state. 



Parabrombenzyl Compounds. 



In preparing the alcohol of this series during the work described in 

 the preceding paper, I was surprised to find that its melting-point was 

 much higher than that given by Mr. Lowery in the second paper* of 

 the series, and as in addition to this some portions of that work were 

 left in a decidedly fragmentary state, I have thought it best to submit 

 the parabrombenzyl compounds to a complete revision, which I have 

 done vyith the following results : — 



Parahromhenzylalcohol, CgH^BrCH20H. This was prepared from 

 the acetate, and purified by crystallization from ligroin, which is by 

 far the best solvent for all the derivatives of the substituted benzyl- 

 bromides described in these papers. 



0.2298 grm. of substance gave 0.3765 grm. of COj and 0.0789 grm. 



♦ These Proceedings, xii. (n. s. iv.) p. 221. 



