PHYSIOLOGY OF THE INVERTEBRATA. 



131 



in Stokes' reduced hsematin.'* .... Prof. Lankester could 

 not obtain derivatives of chlorocruorin, owing, as he has 

 stated, to the apparent instability of this body, which 

 decomposes rapidly," 



Dr. MacMunn has recently examined spectroscopically the 

 behaviour of chlorocruorin with certain reagents, but his 

 investigations will be de- 

 scribed later in this chap- 

 ter, when we consider in 

 detail the chromatology of 

 the Invertebrate blood. 



The red blood of lahm,- 

 hricus can be made to 

 yield crystals of oxyhse- 

 moglobin (Fig. 27), and 

 a solution of these crystals 

 gives an absorption spec- 

 trum (Fig. 28). 



Hemoglobin is also pre- 

 sent in special corpuscles 

 of the blood of Glyccra 

 (one of the Polycliceta) ; 

 as well as in the vascular fluid of NepJielis and Hinido. 



Fig. 27. — Crystals of Oxyhemoglobin 

 FROM Blood of Lumbricus. 



It 



JOa, 



iii|iiii|iiii|iiii|iriT|ilii|iiii|nriim]iiii|iiii|iiii|iiii)iiii|iiii|iiii|iiii|iiii 



60 10 80 90 100 I/O 120 130 140 ISO 



Fig. 28. — Absorption Spectrum of Oxyhemoglobin from 

 Blood of Lumbricus. 



appears that this particular colouring matter is spectro- 

 scopically identical with Vertebrate haemoglobin. 



The Inskcta. 



In a large number of insects the blood is colourless ; although 

 sometimes it is of a green, yellow, or red hue. This colour 

 * Haemooliromogen. 



