62 OF WOOD IN GENERAL 



hard, moderately heavy. Plane, Buttonwood or 

 Sycamore, Pldtanus occidentdlis. 

 i ** Only some of the pith-rays broad. 



J Broad rays numerous : rings bending inwards at 

 the rays : reddish-white or light brown : hard. 

 Beech, Fdgus. 

 XX Broad rays few, hght-coloured : rings very sinuous, 

 bending inwards at the rays : yellowish-white : 

 hard, heavy, tough. Hornbeam, White or Blue 

 Beech, Garpinus. 

 XXt Broad rays few : rings almost circular : reddish- 

 white, soft. Hazel, Gorylus. 

 XXXX Broad rays few : rings bending inwards at the 

 rays : white, becoming brownish-red, with brown 

 pith-flecks, soft. Alder, Alnus, 

 (ii) No broad pith-rays. 

 * Pith-rays narrow but quite distinct to the naked eye. 

 f Wood hard. 

 § Pith-rays with a decided satiny lustre. Maples, Acer. 

 X Rings perfectly circular. 



Ij Wood white, hard and heavy : pith-rays 

 straight : Sycamore or Plane. A. Pseudo- 

 pldtanus, 

 ^^ Similar ; but with winding pith-rays. 

 A. opulifdlium, 

 XX Rings sHghtly wavy. 



^ Wood reddish, very hard, sometimes with 

 curled, bird's-eye or blister figures. 



(a) Sometimes with pith-flecks. Field Maple, A. cam- 

 pestre and Moose- wood, A, pennsylvdnicum, 



(b) Without pith-flecks. Rock or Sugar Maple, A, tar- 

 bdtum. 



mf Wood reddish, but Hghter, hard, with very 

 fine but conspicuous pith-rays. 



(a) With distinct, dark-coloured heartwood. Red Maple, 

 A. mbrum. 



(b) Without distinctly coloured heartwood. Norway or 

 Plane Maple, A. platanoides. 



Ifllll Wood Mght-ooloured, reddish, or yellow, 

 lighter and softer. 



(a) Red-tinged, sometimes curled. Silver or soft Maple, 

 A, saccharinum. 



(b) Yellowish, with very broad rings : vessels minute, 

 numerous. Box-elder, A. Negurido. 



