The book can be found here
http://lovestarz.com/jansky.html
Quote:
extracted from the text This biological clock mechanism can easily be tested in your own home. In the Fall, place some flower bulbs in darkest part of the cellar, away from all light, and leave them there until the following Spring. Check them periodically, and you will find that they do not sprout during the Winter months. But when their normal growing time arrives in Spring, they sprout even in storage.
When bulbs are stored, the tissues do not die, they “breathe.” Dr. Brown carefully measured the rate of respiration (utilation of oxygen) by bulbs in the stored condition. His experiments showed that as Spring approaches, the rate of respiration increases; they require and use more oxygen. The only possible signal these bulbs could receive is from the magnetic-cosmic field surrounding the Earth.
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Or far more likly temperture changes.