Physical Aspects of Protoplasviic Streayning 



217 



Fig. 7 — continued. 



In Figure 10 the form and amplitude of each successive wave is 

 almost the same. As the wave repeats nearly the same details of the 

 change, it is approxiinately periodic within this range of the time 

 scheme. It is noteworthy that the curve shows a special concavity 

 following each trough and also, a somewhat similar concavity fol- 

 lowing each crest. The wave as a whole is not symmetric, but it does 

 show a symmetric character. The rhythmic interval (period) is 

 only 84 seconds. The dash-dot line, which will be considered in the 

 following section, cuts the wave into two equal + and — areas. 



In Figure 11 the wave form is very characteristic. The wave rises 

 suddenly, then falls rather suddenly at first, and later more gradually 

 until the trough is reached. Nevertheless, the form of each rhythmic 

 pattern is very similar, although the magnitude of the wave gradually 



