A HAND-BOOK FOR THE STRANGER IN PHILADELPHIA. CONTAINING DESCRIPTIONS OF ALL THE OBJECTS OF INTEREST IN
"the City and its environs"
WITH VIEWS OF THE PUBLIC BUILDINGS,
BY A PHILADELPHIAN.
AUTHOR OF " THE AMERICAN GUIDE BOOK," ETC., ETC.
Philadelphia:
GEORGE S. APPLETON,
164 Chestnut Street.
1849.
OK, at least these lovebirds know to get their loving on inside of a building. A lot less cold than trying to love and embrace someone in the cold outdoors. Good on them!
The structure a triacyglicerol, a.k.a fat. This fat molecule possesses three identical, saturated fatty acid (palmitic acid) units, linked to a glycerol molecule. Drawn in Inkscape.
an image from the US government EPA "Sunwise" program. I converted it from PDF format. the source link is here - http://www.epa.gov/sunwise/doc/poster.pdf