E-book sales in April rose 127.9%, to $27.4 million, at the 13 publishers who supply results to the AAP’s monthly sales report. The increase was the slowest in the year, but for the four month period e-book sales from reporting publishers were up 217.3% to $117.8 million compared to the same period in 2010. Any industry members expecting e-book sales to grow on a month-by-month basis have been disappointed so far this year. E-book sales have fallen every month since January, largely due to the cyclical nature of the overall book business. Indeed, the $27.4 million in April e-book sales represented 4.3% of all sales reported in the month, while the $31.9 million in e-book sales reported in January was only 3.9% of all sales reported in that month.