66o 
Bailey . — The Evolutionary History of the 
Bibliography. 
1. Bailey, I. W. : Relation of the Leaf-trace to the Formation of Compound Rays in the Lower 
Dicotyledons. Annals of Botany, vol. xxv, No. xcvii, January, 1911. 
2. — : Reversionary Characters of Traumatic Oak Wood. Bot. Gaz., vol. 1, No. 5, 
Nov., 1910, pp. 374-80. 
3. • Notes on the Wood Structure of the Betulaceae and Fagaceae. Forestry 
Quarterly, vol. viii, No. 2, 1910. 
4. Eames, A. J. : On the Origin of the Broad Ray in Quercus. Bot. Gaz., xlix, No. 3, March, 1910. 
5. ; On the Origin of the Herbaceous Habit in Angiosperms. Annals of Botany, 
vol. xxv, No. xcvii, Jan., 1911. 
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of Botany, vol. xxv, No. c, Oct., 1911. 
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EXPLANATION OF PLATES LXII AND LXIII. 
Illustrating Mr. Bailey’s paper on the Foliar Ray. 
PLATE LXII. 
Fig. 1. Castanea dent at a. Tangential section of the mature wood, showing the uniseriate 
rays, x 60. 
Fig. 2. Casuarina , sp. Transverse section of the mature stem, showing the depression in the 
outline of the xylem produced by an aggregate ray. x 20. 
Fig. 3. Castanopsis trihuloides. Transverse section of the mature stem, showing a small 
segment of wood which is depressed by two closely approximated foliar rays, x 20. 
Fig. 4. Alnus mollis. Transverse section of a mature vigorous twig, showing numerous rays 
of the aggregate type in the first and second annual layers of growth, x 20. 
Fig. 5. Alnus yasha. Transverse section of the node of a mature twig, showing a well- 
developed aggregate ray in the vicinity of the leaf-trace. The ray is seen to die out in the third 
annual ring, x 20. 
Fig. 6. Castanea dentata. Transverse section of a vigorous mature root, showing the retention 
of aggregate rays. X 20. 
Fig. 7. Alnus yasha. Transverse section of a vigorous mature root, showing the retention 
of aggregate rays, x 20. 
Fig. 8. Alnus mollis. Transverse section of the mature stem in the vicinity of a severe injury, 
showing a large aggregate ray which has been recalled traumatically. x 40. 
Fig. 9. Alnus mollis. Transverse section of the mature root, showing aggregate rays recalled 
by a severe injury, x 20. 
Fig. 10. Ostrya virginiana. Transverse section of an insect gall in a mature twig, showing the 
traumatic recurrence of an aggregate ray. The ray produces a sag in the outline of the xylem and 
is capped in the phloem by a dark-coloured cluster of sclerenchyma. x 100. 
