133 
The regular paper of the evening was then presented by Miss 
Marion McEwen, entitled “The Comparative Anatomy of Corema 
Conradii and Corema alba.’ The paper was illustrated by draw- 
ings and specimens. The history and distribution of the genera 
and species of Empetraceze and the morphological relations of the 
Coremas were briefly presented, and the general anatomical char- 
acters of the leaves and stems of the latter described and con- 
trasted. The chief object of the study was to determine the gen- 
eric and specific relationship of the two, and the conclusion was 
reached that they were distinct species of one genus. Inciden- 
tally, their anatomical relations with the Ericacee were pointed 
out. 
Dr. Britton discussed the distribution of the order and re- 
marked that it indicated generic differences in the two species, but 
considered that the results of Miss McEwen’s studies disproved 
this theory. 
Dr. Britton presented a small trunk of Zanthoxylum Clava- 
Herculis 1. and remarked upon its peculiar corky spine-bases and 
its similarity to and confusion (as to common name) with Araha 
Spinosa L. Dr. Rusby remarked that an anatomical study of the 
barks had led the late Prof. John M. Maisch to the conclusion 
that there was not a specific identity between the plants called Z. 
Clava-Herculis of the Southern United States and of the West 
Indies, a conclusion afterward confirmed by systematic botanists. 
Miss Gregory remarked that the age of the tree could be deter- 
mined from a section of the corky cushions as well as by counting 
its annual rings. 
TuEspAY. EvENING, FEBRUARY 13TH, 1894. 
The President in the chair and seventeen persons present. 
A letter was received from Mrs. Lydia D. Pychowska, de- 
scribing the formation of large ice crystals in late autumn on 
_ Stems of the scarlet Mexican Salvia. Dr. Britton remarked on — 
Similar phenomena observed by Prof. Lester F. Ward in Cunila, 
and Mr. Kearney stated that Elliott has recorded them in Pluchea. 
Their frequent occurrence in Helianthenum is well known. — 
The following papers were read: | Re me 
“A Review of the Fossil Sa/vanias with Description ea kya hi 
