268 Double Cross- Grain 



In conclusion I wish to record my thanks to Professor Percy Groom 

 for suggesting this investigation, providing the material and for help 

 throughout the progress of the work. 



REFERENCES. 



(1) Groom, P. .Shrinkage, Swelling and Warping of Cross-grained Woods. No. 1, 



Yang. Dipterocarpus sp. Annals App. Biol, in, 1916. 



(2) The Evolution of the Annual Ring and Medullary Rays of Quercus. Ann. 



Bot, Vol. xxv, 1911. 



(.*}) Brandis, D. Indian Trees, 1911. 



(4) Schimper, A. F. W. Plant-Geograpliy. English edition, 1903. 



DESCRIPTION OF PLATE XIII 



I. Shorea robusta. The series of fractures obtained by radially splitting sticks sawn 

 transversely an inch broad, from an 18 inch radial board. Several of the more prominent 

 rings inked over. 



II. Chloroxylon Swietenia. Prepared as in I. 



III. Gmelina arborea. Radial fractures obtained in a portion of the transverse disc. 

 Several rings inked in. 



IV. Holopielea integrifoh'a. Radial fractures in a portion of the transverse disc. 



V. Holoptelea integrifolia. Longitudinal series of fractures prepared as in I. 



