VI PREFACE, 



any scientific points which were not clear to 

 the short-hand writer ; hence all that is differ- 

 ent arises solely from the impossibility, alas ! 

 of conveying the manner as well as the matter 

 of the Lecturer. 



The interest which was felt in those num- 

 bers of the CHEMICAL NEWS in which the 

 lectures appeared was so great that the re- 

 publication of them in a separate form was 

 considered to be almost a duty to those young 

 lovers of science to whom a purely chemical 

 journal with its inevitable technicalities would 

 be a sealed book. May the readers of these 

 lectures derive one tenth of the pleasure and 

 instruction from their perusal which they gave 

 to those who had the happiness of hearing 

 them! 



W. C. 



