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both true; first that if a house is struck by lightening property will be destroyed; and second, that it shall lighten, then it will bw true that insurance will be high.

Here parts of the expression are three and four times enclosed.
Now I say of any part of an expression which is encircled any odd number of times that it is oddly enclosed and of any part that is encircled any even number of times, reckoning zero as an even number, that it is evenly enclosed.
Therefore I say of a part that is not enclosed at all that it is evenly enlosed.
This will be found convenient.

I call this whole system of expression the System of Existential Graphs.
By an existential graph, or as I shall commonly call it a graph, I mean anything which taken by itself would, acending to the principles of thia system, represent