Alert readers will have noticed that not much has happened on this blog over the last couple of months. One of my excuses is that it is summer. Another is that I have been contributing to the Early Modern Experimental Philosophy blog, which I encourage you to read if you do not already do so. But the real reason is that in October I will begin a post-doc at the Max Planck Institute for the History of Science, and I am busy tying up loose ends in Cambridge before I head east. When regular blogging resumes in autumn, the following topics will be high on the agenda: -- remarks on my paper that appeared in the June issue of Historical Studies in the Natural Sciences. There are some big issues that didn't make it into the paper and that I would like to highlight in a blog post. -- a response to the interesting discussion about the internal/external distinction that Darin Hayton has summarised here. -- a continutation of my series of posts on the symmetry principle in the history of science. There is more to say about this principle, and I promise I will say it more succinctly than I did here or here. -- a continuation of a series of posts on Thomas Kuhn's legacy for historians.