Fig. 81. — Chart of the daily temperatures for the month of June, taken at the 

 Powder Hole at Monomoy Point in 1906 and 1907. The average of the daily 

 temperatures at 1, 10 and 20 feet, taken at 6 a.m., 12 m. and 6 p.m., is given. The 

 great irregularity of the curve is due to the fluctuation of this small body of water 

 with changes in the temperature of the air. The season of 1907 was nearly two 

 weeks behind that of 1906, as during the early part of June the temperature was 

 from 8° to 10° colder, but by June 19 the two became approximately the same 

 as is shown by the intersection of the curves on the chart. The principal fact 

 shown by the plot is the location of the "spawning" temperature, or the tempera- 

 ture necessary for spawning. In 1906 the scallops first spawned on June 12, in 

 1907 on June 21. In each case spawning did not occur until the water reached the 

 temperature of 61%°, although there was nine days' variation between the two 

 years. 



Fig. 82. — The Food Value of the Scallop. — The relative proportion, by 

 weight, of the various parts of the average scallop is graphically represented by a 

 series of rectangles, corresponding to (1) the total weight, 1.5 ounces, or 100 per 

 cent.; (2) total non-edible part, 1.23 ounces, or 82.23 per cent., which includes 

 both shell and non-edible soft part; (3) shell, .74 of an ounce, or 49.43 per cent.; 

 (4) non-edible soft part, .49 of an ounce, or 32.8 per cent.; (5) actual food, .27 of 

 an ounce, or 17.77 per cent. 



