400 



SUMMAKY OF CURRENT RESEARCHES RELATING TO 



The two fossil specimens examined were Sequoia Langsdorfii and 

 Taxodium distichum miocenum. As a whole the investigation afforded 

 only negative resnlts, but two Interesting observations were made— viz. 

 the structure of the epidermis of the leaves confirms the previously 

 proved close relationship of Sequoia and Taxodium ; also, these genera 

 were represented in the tertiary polar flora, although probabl}' by other 

 species and forms than those of the present day. S. Greves.';' 



Physiological and Morphological Correlations in Herbaceous 

 Angiosperms.— Jeffrey and ToRREY(i)0^. Gaz., 1021, 71, 1-31, 7 pis., 

 4- figs.). Herbaceous dicotyledons appear to have developed from 



Fig. 1. — Nodal region of Bumex 

 sp., showing fusions between 

 opposed strands of axis and 

 branch. 



Fig. 2. — A lower plane of section 

 of same with a greater^ number 

 of amphivasal bundles. 



Cf-S 



Fig, 3. — Nodal section of Zea. The leaf base has just fused with the 

 [\i39a\ axis, and shows a very large number of bundles. 



arboreal types by a development of storage rays about the leaf- traces. 

 In the more primitive types these rays are shallow longitudinally, but 

 deep in the radial direction ; in higher types these rays diminish in 

 i-adial dimensions, but show an increase in the vertical direction, often 



