1888 - 89 .] Haycraft and Duggan on Coagulation by Heat. 375 
The Action of Sodium Chloride on a Solution of Serum Albumen 
already saturated with Magnesium Sulphate. 
In this case the coagulation was lowered as sodium chloride was 
added in greater and greater quantity. 
(a) Serum albumen, saturated with magnesium sulphate, became 
opalescent at 77° C., and coagulated at 79° C. 
(b) The same solution, plus 10 per cent, sodium chloride, became 
opalescent at 72° *5 C., and coagulated at 75° C. 
( c ) The same solution, plus 20 per cent, sodium chloride, became 
opalescent at 70° C., and coagulated at 73° C. 
A larger quantity of common salt was not added, since 20 per 
cent, did not dissolve readily. 
The Action of Magnesium Sulphate on the Coagulation 
Point of Vitellin. 
Some vitellin was dissolved in a dilute solution of magnesium 
sulphate. Some of this was saturated with the salt, the precipitate 
filtered off, and the filtrate tested. 
(a) Vitellin, dissolved in a saturated solution of magnesium 
sulphate (100 per cent.), became opalescent at 88° C. Coagulation 
did not occur even on boiling, a few flocculi alone appearing. 
(b) Vitellin, dissolved in a 50 per cent, solution of magnesium 
sulphate, became opalescent at 87° C., and coagulated at 89° C. 
with flocculi. 
(c) Vitellin, dissolved in a 25 per cent, solution of magnesium 
sulphate, became opalescent at 81° C., and coagulated at 86°*5 C. 
(< d ) Vitellin, dissolved in a solution containing 12’5 per cent, 
magnesium sulphate, became opalescent at 79° C., and coagulated at 
82°*5 C. 
(e) Vitellin, dissolved in 6 ’25 per cent, solution of magnesium 
sulphate, became opalescent at 74° C., and coagulated at 79° C. 
(/) Vitellin did not completely dissolve in 3J per cent, 
solution of magnesium sulphate. It was not heated. 
When further diluted until only about 1 per cent, magnesium 
sulphate was present, a distinct precipitate separated out in the cold. 
This experiment was repeated with a more dilute solution of 
vitellin. The coagulation points at corresponding strengths of the 
