INTRODUCTION OF FOREIGN SPECIES. \Q1 
Upper Canada ; and, if we may judge by the climate 
and physical characters, they must be as abundant there 
as in the northern parts of the United States. But, as 
we are not able to particularize species, or their local- 
ities, or the extent of their range north of Lake Erie, 
we have omitted them in the table. The few species 
known to extend north of the St. Lawrence River, are 
included in it. 
We are aware that no important deductions can be 
drawn from this table in its present imperfect condition, 
and therefore offer it with some hesitation. But as the 
facts which would go to complete a table of this kind, 
must necessarily be collected before we can determine 
with accuracy the species which are indigenous to the 
United States exclusively, we have thought it expedient 
to furnish the outline, in the hope that others would, ere 
long, provide the materials for filling it up. It is also 
not improbable that some of the species, now supposed 
to be identical with extra-hmital ones, may prove to be 
different. The same facts might also have an important 
bearing upon the question of the local origin of the sev- 
eral species. For the species contained in the table, 
we have given such authorities as are known to us ; 
where none are named, we have relied either upon our 
own personal knowledge, or upon the information of per- 
sons whose accuracy we could not doubt. 
42 
