METEOROLOGICAL OBSERVATIONS ON REN NEVIS. 97 



15°-5, the reduction of the two barometers to sea level closely agrees after 

 a further reduction for diurnal and seasonal differences, the final dif- 

 ference being only the small difference of 0'005 inch on an average of the 

 ten years beginning with 1891. But if, on the one hand, the mean 

 temperature differences be 12°-0 or less, the difference of the reduced 

 barometers is much less ; and, on the other hand, if the temperature 

 differences be 18°"0 or more", then the difference of the reduced baro- 

 meters is much greater. In the former case the type of weather has 

 been strongly anticyclonic, but in the latter equally strongly cyclonic. 



A vital result which comes out in the course of this discussion is 

 shown in the hourly reduced daily values indicating the transition from 

 the anticyclonic to the cyclonic type of weather to be generally slow, 

 extending over several days, thus prolonging in many cases the time of 

 our prevision of the more marked weather changes. It is contemplated 

 that at least another year's discussion of the important question here 

 raised will be required. 



It is scarcely necessary to remark that the result here empirically 

 arrived at is in accordance with the principle laid down by Dalton : 

 ' Air charged with vapour or vaporised air is specifically lighter than 

 when without the vapour ; or, in other words, the more vapour any given 

 quantity of atmospheric air has in it, the less is its specific gravity,'^ 



Statistics concerning the Training of Chemists employed in Enqlish 

 Chemical Industries. — Report of the Committee, consisting of Fro- 

 fessor W. H. Perkin (Chairman), Professor G. G. Henderson 

 (Secretary), Professor H. E. Armstrong, and Mr. G. T. Beilby. 



The Committee decided that the best method of obtaining the desired 

 statistics concerning the training of the chemists employed in English 

 chemical industries was to send a circular-letter, with a form for reply en- 

 closed, to all those members of the Society of Chemical Industry who, so 

 far as could be judged from the designations given in the list of members, 

 occupy a position as manager or chemist in a works. This method was 

 adopted because the great majority of the chemists engaged in techno- 

 logical work in this country are members of that Society, and because 

 no other means of obtaining the information seemed practicable. The 

 result of the inquiry was that more than half of those addressed sent 

 replies to the circular. It is probable that a considerable proportion of 

 those who did not reply are not engaged in chemical works, and therefore 

 the following statistics may be considered to give a fair idea of the present 

 position. 



Information concerning their course of training was received from 

 502 managers and chemists employed in English chemical industries. 

 Of these, 107, or 21 per cent., are graduates, and 395 have not taken 

 a degree ; 111, or 22 per cent., are Fellows or Associates of the Institute 

 of Chemistry. 



' Dalton, Meteorol'igiccil Observations and Essays, 2ncl ed,, Manchester, 1834, 

 p. 100. " ■ 



;902. H 



