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- 8 - 



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. 



6. GROOM, PERCY : The Evolution of the Annual Ring and Medullary Rays of Quercus. Annals 



of Botany, vol. xxv, No. c, Oct., 1911. 



7. JEFFREY, E. C. : The Comparative Anatomy and Phylogeny of the Coniferales. Part I. The 



Genus Sequoia. Mem. Boston Soc. Nat. Hist., vol. v, No. 10, pp. 441-59, PI. 68-71. 



8. JOST, L. : Ueber einige Eigenthiimlichkeiten des Cambiums der Baume. Botan. Zeitung, Bd. lix, 



p. 15. 



9. HOLDEN, RUTH : Reduction and Reversion in North American Salicales. Annals of Botany, 



vol. xxvi, No. ci, Jan., 1912. 



10. : Some Features in the Anatomy of the Sapindales. Bot. Gaz., Jan., 1912. 



11. STOPES, M. C., and FUJII, K. : Studies on the Structure and Affinities of Cretaceous Plants. 



Phil. Trans, of the Royal Soc. of London, Series B, vol. cci, pp. 1-90. 



12. THOMPSON, W. P. : On the Origin of the Multiseriate Ray of the Dicotyledons. Annals of 



Botany, vol. xxv, No. c, Oct., 1911. 



EXPLANATION OF PLATES LXII AND LXIII. 



Illustrating Mr. Bailey's paper on the Foliar Ray. 



PL.ATE LXII. 



Fig. i. Castanea dentata. 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 tribuloides. 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 

 f 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. 



