The first thing these drawings record is paper under pressure. Graphite lands on white, gray-blue, gray-green, tan, brown, and laid sheets, while object titles keep route and month close to the image. Colombia, the Rio Magdalena, Jamaica, Bloxburgh, ferns, parrots, weather, and a house are all part of the evidence.

Frederic Edwin Church's 1853 and 1865 sheets work through accumulation. A single drawing can carry plant forms, a meteorological note, an architectural edge, or a place name. Their unfinished character matters because the archive preserves observation before it hardens into a studio picture.

Kenyon Cox's Bleeding Hearts from 1874 shifts the group into a sketchbook of ornament. That move is useful: botanical study becomes a source for pattern, design, and training, with plant form entering a decorative economy through a page that still looks provisional.

The importance of this section comes from classification as much as image. These are records of field looking, but they are also museum objects whose titles, dates, media, and source links decide how travel, ecology, and drawing can be found again.