REDUCTION IN COST OF SERUM. 409 



animals can readily be doubled by injecting one-half of one per cent 

 solution of potassium citrate into the peritoneal cavity of the virulent 

 blood animal and collecting this artificial peritoneal fluid after the 

 animal has been bled to death. 



3. The bullocks here used for virulent blood weigh between 200 and 

 250 kilos, each costs 50 pesos and yields about 5 liters of blood, each liter 

 of blood costing 10 pesos. Since using the artificial peritoneal fluid, we 

 obtain 5 liters of blood and 5 liters of peritoneal fluid, in all 10 liters 

 from each bullock, at a cost of 5 pesos per liter. 



