Fig. 66.—The Thermo-crescent Curve.
TABLE XI.—RATE OF GROWTH FOR DIFFERENT TEMPERATURES.
| Temperature. | Growth. | Temperature. | Growth. |
| 22°C | 0.00 µ per sec. | 31°C | 0.45 µ per sec. |
| 23°C | 0.02 µ " " | 32°C | 0.60 µ " " |
| 24°C | 0.04 µ " " | 33°C | 0.80 µ " " |
| 25°C | 0.06 µ " " | 34°C | 0.92 µ " " |
| 26°C | 0.08 µ " " | 35°C | 0.84 µ " " |
| 27°C | 0.12 µ " " | 36°C | 0.64 µ " " |
| 28°C | 0.16 µ " " | 37°C | 0.48 µ " " |
| 29°C | 0.22 µ " " | 38°C | 0.30 µ " " |
| 30°C | 0.32 µ " " | 39°C | 0.16 µ " " |
I give in figure 67 a curve showing the relation between temperature and growth.
Fig. 67.—Curve showing relation between temperature and rate of growth.
It will thus be seen that, in the course of an experiment lasting about twenty minutes, data have been obtained which enable us to determine the rates of growth through a wide range of temperature. We have likewise been able by the first method to make very accurate determinations of the temperature maximum and minimum. In short, by adopting the methods described, the cardinal points of growth and the rate of growth at any temperature, may be determined with a precision unattainable by the older methods, of averages or of prolonged observation.