PREFACE. IX 



As regards foreign Kterature, I have scarcely had occasion to go beyond the 

 tolerably complete collection of works which (thanks to the vigUance of Messrs. 

 Wi lliam s and Norgate) my private shelves contain ; but, in this connection, I beg 

 to offer my acknowledgments to D. F. Weinland of Frankfort, C. M. Diesing of 

 Vienna, E. Claparede formerly of Geneva, and R. Leuckart of Giessen, for their 

 kindly gifts. 



T. S. 0. 



MroDMiSEX HospiTAii Medicaii Coiij;qe, London, 

 September, 1864. 



