Infranodal Organs in Calamites and 
Dicotyledons, 
BY 
EDWARD C. JEFFREY, Ph.D. 
With Plates VIII and IX. 
I. 
I N a recently published article 1 the writer has described 
his investigation of the development and anatomy of the 
genus Equisetum , and made some suggestions in regard to 
corresponding features in the structure of Calamites. During 
the past summer he has had the opportunity of examining 
several of the more important European collections of Cala- 
mitean fossils, and has been able to put to the test the 
suggestions made as a result of the study of the anatomy of 
Equisetum . 
At the end of the article referred to above, appeared the 
customary summary of results and conclusions. In the fifth 
paragraph of the summary the statement is made : ‘ The 
branches of Calamites did not, as has been stated in recent 
years, arise above the nodes, but, like those of the Equise- 
taceae, originated either more or less exactly from the centre 
of the ring of nodal wood, or from its lower border.’ In the 
sentence quoted the writer used the term node in the sense 
1 Mem. Bost. Soc. Nat. Hist., vol. v, No. 5, 
[Annals of Botany, Vol. XV. No. LVII. March, 1901.] 
