V] TANNING MATERIALS 57 



peat with 2 successive portions (150-250 cc. each) of water for a total of 14 hours, 

 heating at such a rate that approximately 330 cc. of water will be condensed per 

 hour. Combine all the extracts in the graduated liter flask in which the first per- 

 colate was received. Heat to 80°C., cool, and make up to the mark. 



21 ANALYSIS OF THE EXTRACT. 



Proceed as directed under 2—8, inclusive. If more dilute solutions than the 

 directions specify are employed in the determination of nontannins, the amount of 

 hide powder used is reduced, as directed under 14. 



BIBLIOGRAPHY. 

 1 J. Am. Leather Chem. Assoc, 1906, 1: 32. 



