Vlll PREFACE. 



taken by Professor Turner, and in the editorial labour 

 of correcting and revising the proofs he has had the 

 most willing co-operation of the Rev. J. T. Goodsir, 

 who has given every facility for examining the mass 

 of accumulated manuscript, and has taken the most 

 active interest in the progress of the work. 



The papers are arranged, not in chronological 

 order, but according to their subject-matter. In the 

 first volume will be found a number of lectures on 

 anthropological and psychological questions, none of 

 which have previously been published; and several 

 memoirs on descriptive comparative anatomy, of which 

 the essays on Tethea, and on a New Mollusc, have not 

 previously appeared in print. Two papers, written 

 conjointly with the late Professor Edward Forbes, and 

 a brief Appendix containing some detached observations 

 selected from his note-books, close this volume. The 

 second volume contains memoirs on development and 

 morphology, together with a number of papers on ana- 

 tomy, physiology, and pathology. Of the papers in this 

 volume, most of those on the mechanism of the joints 

 are new. The configuration of articular surfaces, and 

 the movements of the joints, had been for many years 

 the subject of careful study by the late Professor, and 

 in addition to the essays on the knee and hip, his 



