After the meeting, Darwin decided to write "an abstract of my whole work". He started work on 20 July 1858, while on holiday at Sandown, and wrote parts of it from memory. Lyell discussed arrangements with publisher John Murray III, of the publishing house John Murray, who responded immediately to Darwin's letter of 31 March 1859 with an agreement to publish the book without even seeing the manuscript, and an offer to Darwin of 2⁄3 of the profits. (eventually Murray paid £180 to Darwin for the 1st edition and by Darwin's death in 1882 the book was in its 6th edition, earning Darwin nearly £3000.)
What did the publisher offer Darwin in payment for the book?
2⁄3 of the profits

The Great Plains is the broad expanse of flat land (a plain), much of it covered in prairie, steppe and grassland, that lies west of the Mississippi River tallgrass prairie states and east of the Rocky Mountains in the United States and Canada. This area covers parts, but not all, of the states of Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming, and the Canadian provinces of Alberta, Manitoba and Saskatchewan. The region is known for supporting extensive cattle ranching and dry farming.
where does the great plains lie?
west of the Mississippi River

The culture of Somalia is an amalgamation of traditions developed independently and through interaction with neighbouring and far away civilizations, such as other parts of Northeast Africa, the Arabian Peninsula, India and Southeast Asia.
Along with Northeast Africa, Southeast Asia and India, what locale had a significant influence on Somali culture?
the Arabian Peninsula