91 



12. — Meteoeological Observations taken at Holly Bank, 



WaTEOKD, DURIXa THE HALF-XEAE ENDING 31 ST AuGUST, 1877. 



By John Hopkinson, F.L.S., F.M.S., etc., Hon. Sec. 



[Read 9th May, 1878.] 



The observations of which some of the principal results are here 

 given are in continuation of those commenced in March, 1876, and 

 already published in our 'Transactions' (Vol. I, p. 217). They 

 are only iip to the end of August, owing to the observations at 

 Holly Bank having been discontinued in September. In October I 

 removed the instruments to my present residence — Wansford House 

 — where the observations have since been carried on. 



I have nothing to add to the previous account of the locality, the 

 instruments, and the method of observation, but it may perhaps be 

 advisable to repeat that all the readings given are corrected for the 

 index errors of the instruments, and that the readings of the 

 barometer are corrected for temperature and altitude. The mean 

 temperature is as before deduced from the readings of the dry-bulb 

 thermometer at 9 a.m. and 9 p.m., and the mean pressure of the 

 atmosphere from the readings of the barometer at the same hours. 



The monthly means of these observations and of other results 

 deduced from them are given in the accompanying table (p. 92). 

 From it the following table, giving some of the most important 

 results grouped into seasons, is compiled. 



Watford. 



For comparison the observations at the Greenwich Observatory 

 are computed as before from Mr. Glaisher's "Remarks on the 

 Weather" in the Eegistrar-General's Quarterly Reports, the values 

 given for mean pressure being reduced to sea-level. 



Greenwich. 



