CHAPTER III THE RATE OF GROWTH

ratio corresponds precisely to a temperature coefficient of 2ôñ4 for each rise of 10ô¯, or about 1ôñ092 for each degree centigrade.

By means of this principle we may throw light on the apparently complicated results of many experiments. For instance, Fig. 28 is an illustration, which has been often copied, of O. Hertwig〙s work on the effect of temperature on the rate of development of the tadpole⁶⁵.

From inspection of this diagram, we see that the time taken to attain certain stages of development (denoted by the numbers III〓VII) was as follows, at 20ô¯ and at 10ô¯ C., respectively.

That is to say, the time taken