46 



BEPORT — 1889. 



In many cases observers willingly paid for their thermometers, but a 

 number of instruments had to be supplied gratis in order to secure obser- 

 vations at interesting places. 



The Committee have to thank Mr. John Gunn for his services in for- 

 warding thermometers and observation books and corresponding with 

 observers. 



The Committee ask to be re-appointed, with the addition of tbe name 

 of the Rev. Mr. Andson and with a grant of 501. 



APPENDIX. 



Directions to Observers acting under a Committee Ob^ the British 

 AssocuTiON, appointed to Investigate the Seasonal Variation of 

 Temperature in Lakes, Rivers, and Estuaries in various parts ob' 

 the United Kingdom. 



1. Purpose of the Worlc. — The Committee wisb to ascertain the rela- 

 tion between the climate and weather of different parts of the country 

 and the temperature of the surface water ; this can only be done by the 

 co-operation of a large number of observers with instruments of the same 

 kind used in the same manner. 



2. Care in Observing. — Observations are quite useless unless they are 

 trustworthy. It is very easy to read a thermometer, and on this account 

 mistakes are often made through carelessness. The most vigilant atten- 

 tion to details is absolutely essential in every separate observation. 



3. The Thermometer. — The thermometer is sent enclosed in a paste- 

 board cylinder, packed inside the tin case in which it is to be fixed for 

 use, the whole being enclosed in a tin cylinder, and surrounded by paper 

 folded so as to reduce the shock of an accidental fall in transit. Great 

 care must be taken in unpacking and handling the thermometer. The 

 slit in the cross-bar at the upper end of the japanned tin case is to be 

 widened, if necessary, by. pushing, a pencil through it, and the thermo- 

 meter is then to be shpped in bulb first, without forcing it, until the 

 shoulder, iust above the bulb, rests in the hole of the lower cross-bar. 



