144 



PHYSIOLOGY OF THE INVERTEBRATA. 



This substance (as is well known) forms an oxygenised 

 combination which is very unstable, and which is carried bv 

 the blood across the tissues of the animal, and is there 

 dissociated, yielding its oxygen to the elements of those 

 tissues which require it. 



Prof. Ray Lankester discovered that in some Annelids the 

 haemoglobin is replaced by a green-colouring matter (chloro- 

 cruorin). 



Eeverting once more to the saline matter contained in the 

 blood of the Molhtgca, the author* obtained the following 

 results (i.e., percentages) : — 



Dr. L. Predericqt found 3.016 per cent, of soluble and 

 insoluble salts in the blood of Octopus vulgaris. 



The author of the present volume has submitted to 

 analysis the ashes of the blood of several Invertebrate 

 amm.als. The ashes were obtained by incinerating the blood, 

 partially covered in a platinum dish, at a very low tempera-.: 



* A paper read before the Eoyal Society of Edinburgh on June i, 1891. 

 t Bulletins de VAcacUmie Boy ale de Belgique, 3'= sgrie, tome iv. 



