418 Scientific Intelligence. 
anilin. The formulas of the three ba8es described by Hofmann exhibit 
a remarkable eo ik of homology in which H, is the con- 
stant difference. Thus 
onus - . . Cries 
Rosanilin, - - - - of oN® 
Leuceanilin, - - - Ci gts: 
The conversion of chrysanilin into rosanilin and legcastils appears possi- 
ble, but has not yet been effected. 
Dr. Hofmann has also examined the beautiful blue coloring matter ob- 
tained from erude chinolin by the action of the iodids of methyl, Oe 
and termed cyanin. The iodid of this base has the formula 
NI. Another base homologous with this is found in the commer- 
cial cyanin. Its formula is Ci .H, sN2l, and it appears to pre 
Gy a 
C,H, EERE es 
in the second we have 
2C,,H,,NI4+KO, HO=—C,,H,,N,I+KI+2H0. 
—Comptes Rendus, liv, 428, lv, 817, 849 
Awatyticat CHeEMIstry. 
2. On the Analysis of Borates and Fluoborates.—In solutions which 
contain only boric acid and alkalies, Marienac (Fresenius's Zeitschr ift 
fiir hee ytische Chemie, drittes Heft,) determines the former as follows: 
The solution is neutralized with chlorhydrie acid and chlorid of magne- 
sium, or better, chlorid of magnesium- ammonium is added in such quan- — 
tity that to one part of boric acid at least two parts of magnesia are LB 
ent. The liquid is now made ammoniacal and finally is evaporated to — : 
dryness in a weighed platinum vessel. Should the addition of ammonia a 
cause a precipitate which does not readily vanish on warming, ge a 
moniac must be put in until the liquid becomes, by ee During the = 
ees 
part of the as acid. A small amount of the latter always goes it | 
solution. The filtrate and washings are treated with ammonia © 
again ir Beigua ignited, and washed as before. The second filtrate 
and w ashin nee & e once more treated in the same manner, when. great 
The three atu are ignited together in an open crucible as strong 
as possible and so long as to decompose the traces of chlorid of mag 
we imate they may ai When they are P iitieses it ea : 
n na: 1e of sulphuric acid re a pe ili 
th — with — of an alkali 
