PHYSIOLOGY OF THE INVERTEBRATA. 145 



ture. By so doing the alkaline metals are not volatilised as 

 they are when a high temperature is used. 



The following results represent the averages of three 

 analvses in each case : — 



There is no doubt, from the above analyses, that copper 

 plays an important part in the blood of the Invertebrata ; in 

 fact it plays a similar role to that of iron in the blood of the 

 higher Vertebrata.^ 



* Detected by the spectroscope. 



t See Dr. Griffiths' paper read before the Eoyal Society of Edinburgh on 

 June I, 1891. 



K 



