374 JAMES CLERK MAXWELL. [CHAP. XII. 



Besides many contributions to Nature and other 

 similar publications during his residence in Cambridge, 

 Maxwell wrote several articles for the Ninth Edition 

 of the Encyclopedia Britannica. The last scientific 

 paper he ever wrote was the very brief article on 

 Harmonic Analysis, the proof of which was sent for 

 correction when its author was too weak to read it. 



Although the publication of the Treatise on Heat 

 and of the Electricity and Magnetism falls within this 

 period, they were mainly written during the time of his 

 retirement at Grlenlair. The " small book on a great 

 subject," entitled Matter and Motion, was merely the 

 concise expression of his most habitual thoughts. 

 But his chief literary work during the last seven 

 years of his life was the editing of the Electrical 

 Researches of the Hon. Henry Cavendish, F.R.S. 

 Henry Cavendish was son of Lord Charles Cavendish 



Baltimore. Professor Rowland visited Maxwell more than once, and on 

 these occasions much time was spent in comparing notes on electrical 

 questions. Some instruments which Professor Rowland designed were 

 not only identical with Maxwell's in the relative dimensions of the 

 several parts, but their absolute dimensions also were very nearly the 

 same. After Maxwell's death Professor Rowland pointed out some 

 sources of error in the experimental determination of the Ohm as 

 carried out at King's College, and in the recent redetermination made 

 by Lord Rayleigh in the Cavendish Laboratory these sources of error 

 have been removed. Maxwell's opinion of Professor Rowland was 

 very high, and he frequently alludes to him in his correspondence, and 

 more than once " Rowland of Troy, that doughty knight," appears in 

 his verses, where, as the American investigator in a certain branch of 

 magnetic science studied here by Professor Oliver Lodge and Mr. 

 Oliver Heaviside, he is in one place referred to as " One Rowland 

 for two Olivers." I well remember the interest with which Maxwell 

 looked forward to Mr. Rowland's first visit, and the meeting of " Greek 

 and Trojan " on that occasion at Glenlair. 



