SECTIONAL TRANSACTIONS.— K, K*. 509 



Mr. K. V. Srinath. — Nutrition of the embryo sac in Calceolaria (11.30). 



The disintegration of the scanty nucellus in the ovules of the Sympetalae 

 is now well known. As a result the innermost layer of the massive single 

 integument comes to lie in immediate contact with the outer wall of the 

 embryo sac. In the genera Calceolaria and Herpestris of the Scrophu- 

 lariaceae, this layer of the integument becomes very prominent and the 

 cells become elongated and palisade-like. The process of differentiation 

 starts early, even when the megaspore mother cell is in the meiotic prophase. 

 At this stage the nucellus is a single layer of cells forming a loose envelope 

 around the embryo sac. As development proceeds the nucellus completely 

 breaks down, its cell outlines are lost and it finally disappears. This break- 

 down of the nucellus is nearly coincident with the formation of the eight 

 nucleate sac. 



During the changes in the megaspore, the integumentary cells become 

 very conspicuous with prominent nuclei and densely staining cytoplasm. 

 After fertilisation these cells become less conspicuous. Their behaviour 

 strongly suggests that they function as a nutritive ' tapetiam ' investing the 

 embryo sac and perhaps operative during the changes in the megaspore 

 leading up to the formation of the mature embryo sac. 



DEPARTMENT OF FORESTRY (K*). 



Thursday, August 18. 



Symposium on The cultivation of British hardwoods (11. 15). 



Mr. D. W. Young. — The position of hardwoods in British forestry. 

 Mr. A. P. Long.— The Oak (11.45). 

 Mr. A. L. Felton.— T/te Beech (12.15). 



Afternoon. 

 Sir Roy L. Robinson, O.B.E. — The home-grown timber supply (2.30). 



Symposium on British hardwoods, continued (3.0). 



Mr. J. Macdonald. — Ash and Sycamore. 



Mr. A. H. PoPERT. — Alder and Birch (3.20). 



Mr. W. H. GuiLLEBAUD. — Progress of experimental work on hardwoods 



(3-4o)- 



{Continued on Friday) 



Friday, August 19. 



Symposium on The cultivation of British hardwoods {continued from 

 Thursday) (lo.o). 



Mr. W. A. Robertson. — Some remarks on the utilisation of home- 

 grown hardwoods. 



The paper lays stress on the relation of silvicultural treatment of the 

 crop to the money value of the final yield, and indicates how the defects 



