In the process of gutting out 1923 colonial house attic and found Cabot's Quilt eelgrass insulation. A little history...
"Believing everything had a useful purpose, Samuel Cabot was initially stumped by eelgrass. No one on the Massachusetts shore could think of a use for eelgrass, which got in the way of boats and swimmers, resulting in huge ugly piles of the stuff on the beach. Soon Cabot learned that early settlers had used eelgrass as a crude home insulation. In the summer of 1893 he created a prototype insulation with layers of eelgrass stitched between sheets of heavy paper. The product, Cabot's Quilt, quickly found an eager market and became one of the company's primary products until the mid-1940s."

Should I leave the insulation and just surround it with newer insullation? or take it out entirely?