394 Scientific Intelligence. 
fluorescin—prepared from fericieg and phthalic acid by Baeyer’s 
metho red 
—by bromine, an n diluting with water. The 
precipitate thus obtained Gissolved in alkaline solutions with ae 
characteristic color of eosin, and when crystallized from glacial 
acetic acid, afforded ile > same product as that met with in com 
merce. 
In a paper published subsequently, BaryxEr states that eosin 
was first oo ——— at the Baden Aniline bpetices by 
Caro, and by him introduced to the trade under that name. He 
suggests the following experiment to show the selasouk ‘of eosin : 
A portion of the coloring matter is agitated with water and sodium 
amalgam at a gentle heat. The solution is soon peer nee the 
ow 
tion, the gaowemn changes to fluorescéin and the liquid becomes 
bright een and almost opake, in es d light.—Ber awe 
hem. Ges., viii, 62, 146, Jan., Feb., 1875. 
6. On the Structural Formula of Hydroxylamine.- —The poly 
NH,O, discovered originally by Lossren, and to which he gave 
the name hydroxylamine, possesses great theoretic ‘wok It 
may be regarded as a nia in which hydroxyl replaces an atom 
of hydrogen; as a direct compound of the radicals amidogen an 
hydr r in which an atom of nitrogen has 
or as a compound 
two of its units of attraction saturated by two hydrogen atoms 
while the third is united to one of the bonds of an oxygen atom, 
ie 
the other being saturated by hydrogen; thus fo NOSE 
It would seem as if there could he little eat upon the rational 
constitution of so simple a ody. T above ston Shee) 
tks er ieee Adal to NH,. Hanes from NO;. OH comes 
very readily NH,. gain, “the ammonia-like structure of 
hydr Ricca Si is shown by the fact ror it unites with acids to 
form salts without the formation of water. The structure above 
by anisyl. Callin ing the hydrogen atoms one, two, three, in this 
order N H i OH, we have, when both radicals replace hydrogen, 
benzanishydroxamic acid N(C, H sO)(C, iu 70,)OH and anisbenz- 
