Excerpt from Memoirs of the Historical Society of Pennsylvania, Vol. 4: Part 1

The last two articles, one of which relates to Natural History, and the other to Statistics, are but collaterally within the province of an Historical Society. The last, to a certain extent, may be considered more directly within it, as far at least, as regards the times that are past, and as to the present time, in things that are susceptible of change, and their actual state to be ascertained for the benefit of posterity, as to those things that are immutable and will remain as they are through the succession of ages, they may, perhaps, with more propriety be left to the naturalist whose exclusive attention is paid to those objects which in fact are not within the proper limits of historical science.

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