CHAPTER IX.

THE VARIETY OF NATURE, OR THE DOCTRINE OF COMBINATIONS AND PERMUTATIONS.

1. The Variety of Nature 173

2. Distinction of Combinations and Permutations 177

3. Calculation of Number of Combinations 180

4. The Arithmetical Triangle 182

5. Connexion between the Arithmetical Triangle and the Logical Alphabet 189

6. Possible Variety of Nature and Art 190

7. Higher Orders of Variety 192