1892.] NEW YORK ACADEMY OF SCIENCES. 159 



Boil for H hours ; take out, wash, and dye in a bath of 

 Wood ...... 7.0 gms. 



Water, dist. . . . . .1.5 litres. 



Boil for 1 hour with frequent agitation ; take out and wash. 



Red-wood same way, but use 8.0 gms. of wood. 



No. 10162. 



Boil in a bath of 



Wood 6.000 gms. 



for 1 hour, then wash and sadden in the alumina bath 



A1,(S0,)3 1.000 gms. 



Boil for 1 hour. 



No. 10161. 



Boil in CuSO^ for H hours 



CuSO, ." 0.800 gm. 



Take out, wash, and dye in a separate bath 



Wood ...... 6.00 gms. 



Boil for 1^ hours. 



Peach-wood. 



No. 1 (10150, 10151) K,Cr,0,. 



K,,Cr,0, 0.300 gm. 



~ Boil for 1^ hours; take out, wash, and dye in a separate bath 

 Wood 4.000 gms. 



No. 2. Same as No. 1, using 



Wood 6.000 gms. 



No. 3 (10155) Al. 

 Boil in a bath of 



Wood 6.000 gms. 



Chalk 0.600 gm. 



