(2) 



and Wet Bulb instruments are by Negretti and Zambra, and have 

 been corrected by Mr. Glaisher. The instruments are all between 

 4 and 5 feet above the flat leaden roof, and from 55 to 56 

 feet above half-tide. 



Some few years ago a Kew standard thermometer, certified 

 by Mr. Whipple, was obtained, and has been used from time to 

 time for verifying the indications registered. 



The direction of the wind has been determined by vanes, its 

 force estimated on a scale, inaccurate of course, from o to 6. For 

 several years past a 5 inch rain-gauge by Casella has been used, 

 but previously one 10 inches in diameter. They have stood on 

 the flat covering of a skylight, at just the same height as the 

 thermometers, the level of the top of the gauge being 13 inches 

 above that of the leaden roof. 



The amount of sunshine, and its brilliancy are matters of rather 

 rough estimate, but valuable for comparison of seasons ; the bright 

 " sunshine recorder " now in use at the Falmouth Observatory 

 will furnish corrections. 



The record of the actual weather — wet or dry — at the time of 

 observation, is of considerable value, in relation to different years 

 and different places. 



For the estimate of cloudiness the sky has been approximately 

 divided into ten parts — a rough guess. The results obtained at 

 fully equipped observatories, especially those furnished from 

 Greenwich by Mr^ Glaisher, may be applied with much advantage 

 to supplement these local attempts, which may in return furnish 

 some elements towards completeness of knowledge. 



During the greater part of this long succession of years this 

 Institution has been indebted to its Curator, Mr, Newcombe, for 

 punctuality and accuracy in making and registering observations, 

 and moreover for preparing the tables of results annually issued to 

 the members, and the communication to Mr. Glaisher weekly 

 and Mr. Scott fortnightly, of our observations. 



Through the whole term observations on temperature and rain- 

 fall have been regularly made and recorded by Mr. Whitley at 

 Penarth, half-a-mile east of this Museum, at an altitude of 100 feet. 

 I need not say to what excellent account he has turned these and 

 other like researches, especially in their bearing on agriculture. 



