18 
their scientific value. Asa local exhibit the collection is unique 
and it would take many years of field work to duplicate it, even 
approximately. 
t may also be pertinent to remark that a large amount of 
material recently collected, which is most valuable from the bio- 
logical standpoint, is not suitable for display purposes. Thin 
sections of lignites, cone scales, etc., represent this material, which 
is available for examination under the microscope. A preliminary 
illustrated description of certain of these specimens was issued in 
Fic. 6. Middle Cretaceous flora after Saporta. 
1909,* and a quantity of the crude material is now under investi- 
gation, which it is hoped may form the basis of another mono- 
graph or memoir on the subject. 
The elements included in this flora indicate that at the period 
when it flourished a semi-tropical climate must have prevailed 
here. Eucalyptus, fig, magnolia, cinnamon, persimmon and other 
deciduous trees of southern distribution are prominently repre- 
* «Studies of Cretaceous Coniferous Remains from Kreischerville, New York,” 
Arthur Hollick and Edward Charles Jeffrey. Memoirs New York Botanical Garden, 
vol. 3, May 20, 1909. 
