550 
IOWA ACADEMY OF SCIENCE Vol. XXIV, 1917 
Taking into consideration the fact sufficient chloroplatinic 
acid must be added to combine with all the bases present in 
order to be washable by the alcohol wash, the necessity of find- 
ing a cheaper substitute is at once appreciated. In the writer’s 
opinion, aniline perchlorate is the best reagent to replace the 
highly expensive platinic chloride for the separation and esti- 
mation of potassium. It is easily prepared, is much cheaper 
and is easy to handle. 
LITERATURE CITED. 
1. Serullas, Ann. Clum. Phys., 46, 294, 1831. 
2. Kreider, Am. Journ. Science (3), 49, 443. 
3. Caspari, Z. Angew. Chem., 68, 1893. 
4. Willard , J. Am. Chem. Soc., 34, 1480, 1912. 
5. Jarrell , Journ. A. O. A. C., 1, 400, 1915. 
6. lUd., 1, 29, 1915. 
7. Journ. Am. Chem. Soc., 39, 249, 1917. 
8. Hill, Am. Journ. Science, 40, 85, 1915. 
Chemistry Section, 
Agricultural Experiment Station. 
