PREFACE 



The majority of the papers in the present volume are reprinted 

 from the Quarterly Journal of Microscopical Science, or from the Journal 

 of Anatomy and Physiology ; and to the editors of these journals 

 grateful acknowledgments are due for permission to republish the 

 papers and the plates illustrating them. 



Dr. Hurst's Inaugural Dissertation, and the papers by Mr. Bles 

 and myself, have not been previously published. 



Dr. Fowler's contributions on the Anatomy of the Madreporaria 

 represent work done during his tenure of a Berkeley Research 

 Fellowship, a generous benefaction which has already in his own and 

 in other cases yielded excellent results, and which promises to rank 

 among the most successful and most characteristic of Owens College 



institutions. 



• 



The series of papers on the Development of the Frog, perhaps 

 the most conspicuous feature of the volume, contain the results of 

 investigations on which several of my pupils have, with myself, been 

 engaged for some time past. 



A. M. M. 



Owens College, 



June, 1800. 



