HENRY BARKER HILL 387 



covery of nitromalonic aldehyde led him to a number of interest- 

 ing syntheses of the benzol ring ; and last winter he was engaged 

 in the study of derivatives of pyrazol, another ring-structure. 



An acute sense of the responsibility of publication was always 

 in his mind ; accordingly his words were carefully weighed, and 

 unusually free from misstatements. Work done by students 

 was always repeated with his ow^n hands before publication — 

 instead of being tested only here and there, after the manner of 

 most chemists. His remarkable lectures on organic chemistry 

 w^ere noticeable for the same admirable completeness ; they pre- 

 sented a fineh' balanced and comprehensive view of the subject. 

 In these lectures he occasionally expressed theoretical views of 

 his own which never appeared in print. Many of these views 

 have since been generally adopted at the later independent sug- 

 gestion of others less diffident about publication. An example 

 in point is his opinion concerning the structure of diazo bodies, 

 first conceived by him over twenty years ago, and now con- 

 ceded to be the most probable hypothesis. 



Hill's original work and his lectures were equally conspicuous 

 for thorough know^ledge, convincing logic, and perfect sincerit}-. 

 Until the end his highly cultivated and widely varied tastes con- 

 tinued to be sources of refreshment and pleasure to him, while 

 to those of his colleagues who came closest he revealed also 

 keen and appreciative sympathy, self-forgetting generosity, a 

 stanch and devoted friendship, undaunted courage, and above 

 all, single-heartedness in the search for truth. 



T. W. Richards. 



