Scptcmhcr ' October 



Fig. 3 

 Average increase in length of the two lots of mussels in the experiment 



K, the ratio of the volume to the weight of the shell in mgm. was 

 determined. The specimens from the "dark" box gave the following 

 results. 



The specimens from the "light" box gave the following results: 



No. 



Length x Depth x Thickness x K = Volume 



Weight 



Volume to weight 



10.05 X 5.8 X 4.4 



10.0 X 5.45 X 4.5 



9.1 X 4.75 X 4.4 



X K = 257K 

 X K = 245 K 

 X K = 190.5K 



37.8 mgm. 

 46.6 mgm. 

 35.0 mgm. 



6.79 Kto 1 ' 

 5.27 Ktol 

 5.43 Kto 1 



Average 5.83 K 



