272 Hill and de Fraine.— The Structure of Seedlings. 
Sufficient has been said to show the enormous importance of physiology 
in questions relating to vascular tissues ; for our own part we are strongly 
of the opinion that no real further advance in our knowledge of morphology, 
more especially of the higher plants, is possible without an adequate 
investigation of the physiology of the members concerned. 
With regard to the points raised in the present outline, we are 
engaged in their investigation, but, owing to the complexity of the work, 
definite conclusions cannot be expected for a considerable time. 
Finally, we wish to draw attention to the desirability that those 
engaged on these and similar investigations should pay attention not only 
to the qualitative but also to the quantitative aspects of the subject. 
University College, 
London. 
