Excerpt/Summary not as specified

Website: http://www.mathfairy.com/wp/blog/ The Blog tab is where I show my Posts. I want the post Excerpted on this page but it doesn't appear to be working. On the Settings>Reading panel, I have "Summary" specified for each article in the feed. https://www.dropbox.com/s/r8mfolwewseamnx/summary.jpg?dl=0 On the Excerpt/More Tag Settings, I have an Excerpt Length of 50. https://www.dropbox.com/s/jg2nq9agrhfwlvg/read_more.jpg?dl=0 The full article is still appearing. What else can I do? THANK YOU!