CYCADOFILICALES 



27 



in Fossil Botany, with comparative morphology as its dominant 

 feature. This book makes it possible for those with less training and 

 less mature judgment to secure valuable results when they find ma- 

 terial. He has also done a great service in presenting the subject in 

 a less technical, but still thoroughly scientific way, in his book, Ex- 

 tinct Plants and Problems of Evolution. 



Seward, also, in addition to a long series of research papers, has 

 organized the subject in his book. Fossil Plants. Although both au- 

 thors deal with morphology, taxonomy, and phylogeny, in Seward's 

 book taxonomy is the dominant character. Seward, in his Plant Life 



Fig. 24. — Aneimites fertilis: A, 

 sterile pinnules and a seed (5); B, a 

 seed showing wings; C, a sterile pin- 

 nule and a seed with a long stalk; X 2. 

 — After David White. ^'^ 



Fig. 25. — Pecopteris pluckenetii: fer- 

 tile pinnae with seeds at the ends of 

 lobes of pinnules; X3. — After Grand 

 d'Eury."' 



through the Ages, has done a great service to the educated public and 

 especially to the botanists who are not specialists in paleobotany. 



In Europe the most prominent names are Stur, Renault, Po- 

 TONEE, Zeiller, C. E. Bertrand and Paul Bertrand; more re- 

 cently GoTHAN, KuBART, Krausel, and Florin. Potoniz and 

 Zeiller, besides their research papers, have written books which 

 are of great service to investigators. 



In America, some work had been done with impressions and a few 

 sections had been made of fossil woods; but coal balls, with their 

 well-preserved material, were not known until Noe, in 1922, dis- 

 covered coal balls in various places, and, followed by various stu- 

 dents, began a series of investigations which indicate that American 

 material is as abundant and as well preserved as material in Great 

 Britain and in Europe. It is interesting to note that many of the 

 genera, and perhaps even the species, are the same as on the other 

 side of the Atlantic. 



