108 Scientific Intelligence. 
coffee. 
The alteration of the double salt, by ammonia, when carried to com- 
pletion, or the moderate action of heat, permits the separation of the 
roginate of lead may be obtained pure, and by decomposition by sul- 
phuretted hydrogen the acid is easily obtained and purified. The for- 
one equivalent of oxygen. The further investigation of these substan: 
ces will undoubtedly lead to some striking analogies. G, C..38, 
6. Researches on Blood ; by M. Dumas, (Ann. de Chim. et de Phys., 
a saturated solution of sulphate of soda. On filtration, the liquid pass- 
es clean and colorless, while the globules remain upon the filter. The 
Moreover the attempt to wash the globules by a new quantity of the 
solution was not successful, and without this washing they retain a no- 
in the arterial condition, the saline solution containing them passed col- 
orless through the filter, and left them upon it; on the contrary, as 
‘foon as the globules have assumed the violet tint of venous blood, the 
liquid passes colored. : 
