THE HISTORY OF THE DOBSON. 



No place is more attractive for a spring excursion than the 

 rock-bound shores of a creek or river. On such 

 an outing a sharp-eyed boy will often see large 

 white patches flattened against the gray rocks 

 hanging over the water. Sometimes single 

 circles will stand out in bold relief, while in *'^G-39.-EggMa*s. 

 other places dozens of white splashes may be crowded together 

 side by side to form irregular masses (Fig. 40). 



Fio. 40. — Egg Masses on a Rock. 



If you examine one of these patches (Fig. 39) close at hand, 

 you will find that it is a thin, wafer-like circle, slightly swollen 

 in the middle. The outer surface is smooth. The circle is 



41 



