to divide the space with mathematical precision, thus giving to
each leaf its fair share of room for growth.)

"1. Where is the first diverging point of the stems and roots in
plants, that is to say, the first geniculum?

"2. How do you explain the origin of those leaves on the stem
which, not arising from distinct geniculi, are placed spirally or
scattered around the stem?

"3. Why do some plants, especially trees (contrary to the ordinary
course of development in plants), blossom before they have put
forth leaves? (Elm-trees, willow-trees, and fruit-trees.)

"4. In what succession does the development of the organs of the
flower take place?--and their formation in the bud? (Compare
Campanula, Papaver.)

"5. What are the leaves of the Spergula?

"6. What are the tufted leaves of various pine-trees? (Pinus
sylvestris, Strobus, Larix, etc.). . .

"8. What is individuality in plants?"

The next letter contains Agassiz's answer to Dr. Leuckart's
questions concerning the eggs he had sent him, and some farther
account of his own observations upon them.

AGASSIZ TO BRAUN.