438 Miscellaneous Intelligence, 
“ Peculiar facilities have been afforded for carrying on an investigation 
in this family ; for not only is the author placed in possession of all the 
specimens obtainable, but, being in constant correspondence with leading 
uropean ornithologists, he is enabled through their kind efforts to be 
kept thoroughly informed of whatever relates to this work in the museums 
of the Old World. 
“*North America,’ says Prince Charles Bonaparte, ‘is exceeded by no 
the requisite number is printed off; thus making it impossible to repro- 
duce the work, unless at the original expense, but causing it to become 
more valuable to those possessing it. 
“The work, imperial folio in size, will be issued in parts—each to con- 
tain six plates—to follow each other as rapidly as may be consistent with 
the proper preparation of such large subjects, and will be furnished to sub 
scribers only, at Ten Dollars each, payable on delivery; the number of 
parts probably not exceeding five. It is intended also to give one or 
more plates, as may be required, illustrating the eggs of the different 
species. 
“The author would beg leave to request those who may desire to sub- 
scribe, to sign their names to the accompanying form and enclose it t 
him, as early as may be convenient, to his residence, No. 21 West 384 
street, New York. 
“A list of the subscribers wiil be given with the last number.” 
New York, Feb. 17th, 1864. 
IV. MISCELLANEOUS SCIENTIFIC INTELLIGENCE. 
_1, On the Yellow Coloration of faded Photographic Prints; by M. 
Carey Lea.'—Everything connected with the permanence of photo 
the dark as to the causes of failure. “Sulphuration” is a conv hi 
word, but it would be more satisfactory if we had some idea as to the 
nature of the obnoxious insoluble sulphur compound. she 
The hypothesis which has for some time past become current Is, (28 
boo a depends upon the presence in the print of some sulphur com 
und, which with time acts upon the silver, converting it, as 18 $810) 
_' Communicated for this Journal by the author, and received too late for inse™ 
tion in the foregoing portion of the Journal. 
