_ 97 — 



Is there a difference in the ainount of the water of crystal- 

 lization which determnies the crystalHiie form of the haemocyanin, 

 or are the two difterent crystaUine forins the exponent of two 

 polymeric forms of haemocyanin ? I connot as yet explain the 

 reason of this change in the crystalline form by recrystallization. 

 Haemoglobin may also change its crystalline form by recrystal- 

 lization. 



Haemocyahin of Octopiis macropus. 



No investigation on the crystallization of the haemocyanin 

 of Octopiis macropus is found in the literature. I have crystalli- 

 zed it with the sanie facility as that of Octopiis viilgaris, but I 

 have not obtained, as yet, the characteristical " projectiles " of the 

 haemocyanin of Octopus vulgarls. It has always crystallized in 

 needles, which may attain a very great length. They are repre- 

 sented in fig. 6. 



Fig. fi. — Haemocyanin-crystals from the blood of Octopus macropus. 



On recrystallizing it I have always obtained the same cry- 

 stalline forms. 



Parahaemocyanin. 



1 will observe here that, on allowing the glass containing the 

 crystals and the mother liquor to stand for some time, the cry- 



7 



