How much simpler this is than the old, romantic way of determining when Spring had come! A poet has to depend on his intuition for information, and, on the subject of Spring's arrival, intuition may be led astray by any number of things. You may be sitting over one of those radiators which are concealed under window-seats, for instance, and before you are aware of it feel what you take to be the first flush of Spring creeping over you. It would be obviously premature to go out and write a poem on Youth and Love and Young Onions on the strength of that.
I once heard of a young man who in November discovered that he had an intellectual attachment for a certain young woman and felt that married life with her would be without doubt a success. But he could never work himself up into sufficient emotional enthusiasm to present the proposition to her in phrases that he knew she had been accustomed to receive from other suitors. He knew that she wouldn't respond to a proposal of marriage couched in terms of a real estate transaction. Yet such were the only ones that he felt himself capable of at the moment under the prevailing weather conditions. So, knowing something of biology, he packed his little bag and rented an alcove in a nearby green-house, where he basked in the intensified sun-warmth and odor of young tube roses, until with a cry, he smashed the glass which separated him from his heart's desire and tore around the corner to her house, dashing in the back door and flinging himself at her feet as she was whipping some cream, and there poured forth such a torrent of ardent sentiments that there was really nothing that the poor girl could do but marry him that afternoon.
In fact, if you want to speak astronomically (some people do), you may define Spring even more definitely. Since we are all here together, and good friends, let us take the center of the earth as origin, and, once we have done this, the most natural fundamental axis is, obviously, the earth's rotation. The fundamental plane perpendicular to it is the plane of the equator. That goes without saying.
Now, here we go! Coördinates referred to in this system are termed equatorial, and I think that you will agree with me that nothing could be fairer than that. Very well, then. Since this is so, we may define Spring by the following geometric representation in which the angle ZOP, made by the radius vector with the fundamental plane, shows a springlike tendency.
This drawing we may truthfully entitle "Spring," and while it hasn't perhaps the color found in Botticelli's painting of the same name, yet it just as truthfully represents Spring in these parts as do the unstable sort of ladies in the more famous picture.
I only wish that I had more space in which to tell what my heart is full of in connection with this subject. I really have only just begun.