PLATE 66 
. a 
MUCILAGE AND RESIN 
1. Cross-section of elm bark (Ulmus fulva, Michaux) showing two cavities 
filled with partially swollen mucilage. 
2. Mucilage mass from sassafras stem bark (Sassafras variifolium, L.). 
3. Mucilage mass from elm bark. 
4. Resin mass from white pine bark (Pinus strobus, L.). 
