Ever Since Darwin
This is an early work by Gould and I felt that he was still finding his way in writing essays. Firstly they are too short to develop a satisfactory argument - they tend to end suddenly. Secondly, having several essays dealing with the same subject makes the book a bit repetitive. These are minor criticisms though - most collections of essays suffer from these problems, and it's to Gould's credit that he managed to avoid them in his later works. But this book is still well worth reading, especially if you prefer dipping into the shorter essays, rather than reading the whole book at once.