Drushel — Estimation of Potassium in Animal Fluids. 561 



Table II. 



Amount K 2 found 



Nature of taken , * , 



fluid grm. grm. per cent Method 



I (1) Defibrinated 10-89 0*0227 0*21 Grav. 



(2) pig's blood . 11-21 0-0228 0*20 Vol. 



(3) 20-33 0-0391 0*19 " 



(4) 10-16 0-0203 0-21 " 



(5) .__ 10-85 0-0211 0-20 " 



(6) 11-03 0-0236 0-21 " 



II (1) Sheep's blood 30-00 0*0174 0-058 Grav. 



(2) 30-00 0-0179 0-060 Vol. 



(3) 30-00 0-0181 0-060 Grav. 



(4) 30-00 0-0181 0-060 Vol. 



(5) _. 30-00 0-0180 0-060 " 



III (1) Serum of dog's 



blood .. 10-11 0-0024 0-024 Yol. 



(2) 10-04 0-0024 0-024 Grav. 



(3) .. 10-07 0-0023 0-034 Yol. 



IY (1) Dog's lymph 10-28 O'OOIS 0.018 Grav. 



(2) 10-01 0-0019 0-019 Yol. 



(3) 10-00 00020 0-020 " 



(4) ._ _.. 10-03 0*0019 0-019 " 



(5) 10*12 0-0019 0-019 " 



(6) 10-32 0-0022 0'021 Grav. 



ing the precipitated casein it still contained appreciable amounts 

 of potassium. It was found preferable to evaporate weighed 

 portions of milk to dryness, oxidize with concentrated nitric 

 acid, again evaporate to dryness, and ignite gently until most 

 of the organic matter was burnt off, finishing the ignition after 

 moistening the residue with concentrated sulphuric acid. In 

 the residues thus obtained the potassium was estimated gravi- 

 metrically or volumetricallv as in the previous work. 



The results obtained for potassium in two specimens of 

 cow's milk are given in Table III. 



Table III. 



Milk taken K 2 found 



r •<_ ___^_ ^ 



grm. grm. per cent Method 



I (1) 25-8 0-0413 0-16 Yol. 



(2) 25-8 0-0432 0"17 " 



(3) 25-8 0-0428 0'17 Grav. 



(4) _ 51-6 0-0833 0'16 Yol. 



II (1) 25-7 0-0454 0'18 " 



(2) 25-7 0-0457 0'18 " 



(3) 25-7 0-0451 0-18 Grav. 



Summary. 



AVhere protein does not occur in animal fluids it was found 

 most advantageous to oxidize the dried residue with a 9:1 



