456 Proceedings of the Royal Irish Academy. 



the opposite side of the stem, as is frequently found to be the case with 

 the bundles of the axillary buds. 



In conclusion, I wish to express my gratitude to Professor E. P. 

 "Wright, who gave me much help in this investigation, not only by his 

 valuable advice on many occasions, but also in bringing under my notice 

 various sources of information of which otherwise I should have been 

 ignorant. I am also indebted to Mr. F. "W. Burbridge, curator of 

 Trinity College Botanic Gardens, for his kindness in supplying much 

 of the material needed. 



DESCRIPTION OF PLATES XI. to XIV. 



Plate XI. 



Fig. 1. — Longitudinal section of the apex of Vanda teres, x 20. 



Fig. 2. — Longitudinal section of an axillary bud of Dendrohium 

 chrysanthum. The subtending leaf, which is ruptured 

 by the developing bud, lies on the left of the section. 

 X 20. 



Fig. 3. — Transverse section of an axillary bud of V. teres, x 20. 



Fig. 4. — Transverse section of the stem of V teres, passing longitu- 

 dinally through an axillary bud, the leaves of which 

 are seen as arches over its apex, x 20. 



Fig. 5. — Longitudinal section of a young axillary bud, near the apex 

 of V. teres, x 20. 



Plate XIL 



Fig. 6. — Same as fig. 5, of a younger bud. x 20. 



Fig. 7. — Longitudinal section through a much older axillary bud, 

 showing its flat dome-like leaves as arches over the 

 apex. To the right is the petiole of the subtending 

 leaf, which will be penetrated in the development of 

 the biid. X 20. 



