516 APPENDIX. III. 



brush is nailed, and with a saw-knife, the mem* 

 branes on each side of the sound must be 

 scraped off. The knife is rubbed upon the 

 brush occasionally, to clear its teeth, the pock- 

 ets are cut open with scissars, and perfectly 

 cleansed of the mucous matter with a coarse 

 cloth : the sounds are afterwards washed a few 

 minutes in lime-water, in order to absorb their 

 oily principle ; and lastly, in clear water. They 

 are then laid upon nets, to dry in the air ; but, 

 if intended to resemble foreign Isinglass, the 

 sounds of cod will only admit of that called 

 book, but those of ling both shapes. The 

 thicker the sounds are, the better the Isinglass, 

 color excepted; but that is immaterial to the 

 brewer, who is its chief consumer. 



