Question

what can be assumed by the 26 volume leather bound petition presented to Stowe which begged American women to abolish slavery

Answer 1

I would say it's safe to assume that Harriet Beecher Stowe's novel, "Uncle Tom's Cabin," was hugely popular with abolitionists around the world.  The book was the 2nd-best selling book of the 19th century -- coming in behind only the Bible (the perennial bestseller).  

The 26 leather bound volumes contained signatures from British women from all across the globe who implored their sisters in America to keep up the fight to free the slaves.  The impact of Stowe's book shows that what can be done fighting with the pen is just as mighty as what might be done with a sword!