In vain I let my eyes rest on the spot where the expanding network meets the still shapeless bundle; I can distinguish nothing.

But wait a little, and the fine-meshed tissues will appear with perfect distinctness.
To judge from this first examination, one would guess that an organisable fluid is rapidly congealing into a network of nervures; one seems to be watching a process of crystallisation comparable, in its rapidity, to that of a saturated saline solution as seen through a microscope.

But no; this is not what is actually happening.

Life does not do its work so abruptly.
I detach a half-developed wing and bring it under the powerful eye of the microscope.

This time I am satisfied.