64 ANIMAL PROTEINS 



this tendency is liable to cause poor " substance." The 

 leather, too, readily wets and goes out of shape. Possibly 

 some drumming may be adopted to save time in the early 

 layers, but the most serious rival to the 3 months' tannage 

 is the waterproof chrome sole leather (Part III., Section V., 

 P- 173). 



REFERENCES. 



Parker, /. S.C.I., 1902, 839. 



Procter, " Principles of Leather Manufacture," p. 220. 

 Bennett, "Manufacture of Leather," pp. 179, 259. 

 Bennett, /. S.C.I., 1909, 1193. 



