POSTSCRIPT 



THROUGH the death of Dr Newell Arber in June of last year at 

 the comparatively early age of forty-seven Botany and Geology 

 have lost an able and indefatigable investigator. Since 1901 , 

 the date of publication of his first paper, he laboured incessantly 

 and with success to advance palaeobotanical science. To his 

 activity the Sedgwick Museum of Geology at Cambridge is 

 deeply indebted, and through his personal influence several 

 younger men acquired something of their teacher's enthusiasm. 

 The proofs of this Volume were passed for press in June, 

 1918, but owing to the exigencies of war conditions publication 

 has been unexpectedly and inevitably delayed. 



A. C. S. 



June 18, 1919. 



