PLATE LII 



Fig. i. Split radial face of a creosoted hickory block, showing ty loses (T) in a large 

 vessel. Magnified 12 diameters. Tyloses uncolored; remaining wood substance 

 black with creosote. 



Fig. 2. Tangential section of Aesculus octandra, yellow buckeye X 680, showing 

 two ty loses (T) which have grown out of one medullary-ray parenchyma cell (MR}. 

 Shows open connection between the ty loses and parenchyma cell. 



Fig. 3. Cross section of valley oak, a white oak, showing young ty loses (T) next 

 the bark (B) in vessels (V). 



(47o) 



