The Cytochromes of Plant Tissues 497 



7. The cytochromes of roots are exactly comparable to those of other 

 plant parts. 



8. The low temperature absorption spectrum of purified cytochrome /has 

 been obtained. 



9. It is concluded that it is premature to designate names to the cytochrome 

 b components described here. 



Acknowledgements 



The author expresses warm appreciation to Dr. Britton Chance for his 

 enthusiasm and advice during the course of this study. He also thanks Dr. 

 R. W. Estabrook for reading the manuscript, and Mr. N. Meadow and Miss 

 S. Yao for help in the preparation of cytochrome /. 



This work was supported by a grant from the National Science Foundation. 



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