VI PREFACE 



not merely in valuable suggestions as to the choice and treat- 

 ment of the matter, and careful revision of the whole text, 

 but also in important original contributions. The valuable 

 chapters on the Methods of Cytology and on the Protozoa are 

 from his pen, as is also that on the methods of Embryology, 

 concerning which I am free to say (as I had no share in it 

 myself) that it is probably the most authoritative and masterly 

 exposition of the subject ever written. It is my privilege to 

 be able here to reproduce this admirable little treatise. 



I should be ungrateful if I did not take this opportunity of 

 expressing my thanks to Prof. EANVIER for the graceful and 

 kindly Preface in which he was good enough to introduce our 

 work to the French-reading public. 



To return to the work now before us it remains to be said 

 that it stands in much the same position with regard to the 

 " Traite " as the " Traite " stands in with regard to the original 

 t( Vade-Mecum." - It is not a mere translation of the French 

 work, but has been thoroughly revised, brought up to date, 

 and to a very considerable extent re-written. It goes even a 

 step farther than the " Traite " in the way of throwing less 

 important matter into the background and treating important 

 matter with increased fulness. A still greater number of 

 superannuated or untrustworthy or superfluous processes have 

 been either suppressed or relegated into the background of 

 small type and brief mention. But it also goes a step 

 further than the " Traite " in the way of fuller treatment of 

 important matter. The all-important subject of Fixing and 

 Fixing Agents has been set forth with all the fulness allowed 

 by my knowledge of the matter. A new chapter on Killing 

 has been added. The two chapters on Staining with the 

 Coal-tar colours have been re-written, not translated, and 

 treat the subject very fully. The chapters on Impregnation 

 Methods, on the processes of Paraffin imbedding and Celloidin 

 imbedding, on the methods of Cytology, and on the Central 

 Nervous System have been re-written and brought up to date 

 The methods for Serial Sections .are fully given. And new 



