56 Paul Fourman and Patricia M. Leeson 



they produced a hypertonic urine of low volume when deprived 

 of water, they did not always produce a hypertonic urine with 

 pitressin and water. Under certain circumstances, therefore, 

 the kidney can excrete a hypotonic urine in the presence of 

 pitressin while retaining its ability to respond normally to 

 dehydration. 



Acknowledgements 



We are indebted to Dr. H. E. F. Davies for his help, to Mr. Emlyn 

 Morgan, Mrs. M. Lewis and Miss M. O. Seabright for technical assistance, 

 and to Professor Harold Scarborough for his valuable advice. 



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