PHYSIOLOGY OF THE INVERTEBRATA. 



337 



The composition of the ashes of the nervous matter in each 

 case is represented in the following table : — ■ 



Potash 



Soda . . . . 



Magnesia . . . . 



Lime 



Iron oxide . . . . 



Phosphoric acid (combined) , 



Phosphoric acid (free) . 



Sulphuric acid 



Chlorine 



Silica 



Homarus* 



33-00 



11.98 



1.87 



0.99 



0.16 



41.51 



6.81 



0.90 

 1.96 

 0.82 



jBrtna. 



36.24 



10.87 



1.30 



0.81 



0.21 



40.32 



7-92 

 0.72 



I.2I 

 0.40 



100.00 



The first table gives the chemical composition of the ner- 

 vous matter in a dry state ; the following table gives the 

 composition of the nervous matter with its accompanying 

 water : — 



The last two tables represent the averages of six analyses 

 in each case. 



