194 



W. D. HALLIBURTON. 



So far then these experiments seem to show that the differ- 

 ence of crystalline form is due to some inherent quality of the 

 haemoglobin itself, and not due to any agency in the blood 

 external to the haemoglobin. 



4. The Crystalline forms of Haemoglobin obtained by 

 mixing the Blood from different Animals. 



By mixing the defibrinated blood from two animals, whose 

 haemoglobin crystallises differently, and then preparing crystals, 

 I thought I might obtain some new forms resulting from the 

 mixture. Here my experiments have yielded mostly negative 

 results, but the one positive result I have obtained from such 

 experiments warrants me in recording the whole. The blood 

 of two animals were mixed in about equal proportions, shaken 

 thoroughly, and then haemoglobin crystals prepared by the 

 ether method. 



It will be convenient here again to give my results a tabular 

 arrangement. 



The second case, that of mixing blood from the rat and 

 guinea-pig, is interesting, and demands further description. 

 It shows that it is possible to obtain a new form of haemoglobin 



