Royal Scot. Arbor. Trans., Vol. XLV... FU VGII. 
MICRO-PHOTOGRAPHS OF SECTIONS OF WOODS. 
LONICERA PERICLYMENUM. Honeysuckle. 
Trans. Sect. x 40. 
Fig. 14. 
PoPULUS MONILIFERA. Poplar. 
Trans. Sect. x 80. 
