960 The American Naturalist. [October, 
ful infections conclusive proof of the identity of the species was ob- 
tained. 
5. Observations on the Life-History of Uncinula spiralis B. & C., 
by B. T. GaLLoway ; giving the results of a study of the germination 
of the ascospores. 
6. On the Seed-Coats of the Genus Euphorbia, by L. H. PAMMEL. 
From a study of the structure of the seed-coats it is evident that dis- 
tinguishing marks may be obtained from them. 
7. Observations on the Method of Growth of the Prothallia of the 
Filicineze, with Reference to their Relationships; by D. H. CAMPBELL. 
The author called attention to the similarity between the development 
of the prothallia of Filicinez and the thalli of the Hepaticz, and sug- 
gested that the two groups are genetically related. 
8. Development of the Sporocarp of Grifithsia bornetiana, by V. 
M. Spatpinc. A careful study of alcoholic material enabled the 
author to follow the development of the sporocarp step by step. 
9. Contributions to the Life-History of Isoétes, by D. H. Camp- 
BELL; giving many points in the development of the macrospore and 
the female prothallium. There are indications that Isoétez are related 
to the Marattiacez. 
ro. The Relation of the Mexican Flora to that of the United States, 
by SERENO Warson ; giving first a sketch of the physical features of 
the continent as they aff:ct plant distribution, then recognizing and 
defining three botanical regions, viz.: the Atlantic, the Interior 
(Plains and Rocky Mountains), and fhe Pacific. After citing examples 
of families and genera the conclusion was reached that there is a closer 
connection between the Mexican flora and that of the Atlantic region 
than with that of either the Interior or Pacific. 
11. Distribution of the North American Umbellifere, by J. M. 
Courter, The Umbellifere of North America appear to be massed 
within the United States (especially northwestward), having spread 
southward from an Arctic and possibly from an Asiatic origin. The 
genus Peucedanum is the great North American umbelliferous group, 
and all its species are west of the Mississippi River, forty being peculiar 
to the Pacific States. Cymopterus is a Great Basin genus. The Great 
Plains contain but few species. 
12. Distribution of the Hepatice of North America, by L. M. Un- 
DERWOOD ; referring to our meagre knowledge of our species (but 265 
being known), and discussing as far as possible their general range. 
Four botanical provinces appear to be indicated for North America, 
viz.: Boreal, Medial Austral, and Occidental, to which may also be 
ed 
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