TRANSACTIONS OF SECTION K. 341 



by means of quantitative data obtained from the physiological and chemical 

 reactions of the organisms developing under standardised physico-chemical con- 

 ditions; and a species only has value if diagnosed in such terms. 



There is no evidence free from doubt to indicate how species have arisen in 

 the fungi. The most weighty studies are those on the induction of heritable 

 alterations, but most of these are uncritical, and in the absence of knowledge 

 concerning the genetical constitution of the subject-organisms judgment must be 

 reserved in all cases. 



The subsequent transactions were as follow : — 



5. Lecture on Spartina and Poole Harbour. 

 By Professor F. W. Oliver, F.R.S. 



6. Demonstration by Sir Daniel Morris of the Collection of Conifera 



grown localhj. 



Informal Discussion arising out o/ Professor Priestley's Paper on Root 



Pressure. 



Exhibit of Microscofic Pr&parations by Miss Prankerd. 



7. Report of Committee on Experimental Studies in the Physiology of 

 Heredity. — See Reports, p. 124. 



8. Report of Committee on Sections of Australian Fossil Plants. 



See Reports, p. 124. 



9. Report of Committee on Australian Cycadacese. 

 See Reports, p. 125. 



10. Report of Committee on tJie Organisation of Research in Plant 



Pathology in the British Empire. — See Volume for 1918, Reports, 

 p. 56. 



11. Report of Committee on Training and Research in Horticulture. 



12. Report of Organising Sectional Committee on the consideration of 

 matters relating to the War or Reconstruction after the War. 



1919. D D 



