ELECTROLYTES, CLOTÏNG IN BLOOD LOSS AND NORETHYNODREL 



853 



from approximately 7.3 to 7.0 during removal of about half of the total blood 

 volume; sérum magnésium rose from 2.08 to 7.72 mEq/1. Between 20 and 40 per- 

 cent hemorrhage, the pH decrease seemed fairly uniform; the associated rise in 

 sérum magnésium was 0.31 mEq/1. The average withdrawal times for succeeding 

 blood samples figured on the hemorrhage curve were 32, 58, 128 and 163 secs. 

 Forty percent hemorrhage occurred at approximately 100 secs. 



7.3 7.2 7.1 7.0 



PH 



Fig. 1. 



Two to five blood samples were removed by cardiac puncture from six rats, 129 ± 15 g; pH and 



sample volumes were noted. Curves of percent hemorrhage o o and sérum magnésium 



o o were constructed from clustered pH values. Expt. 2. 



