Meteorological Observations. 331 



(oroperly seemed) for a whole year, or parts of a year, oa 

 elevated summits or other remarkable points, to ascertain their 

 maxima and minima of temperature during absence. In such 

 cases, take care to defend them from discovery, or accident 

 from wild animals, birds, snakes, &c. In taking it up for 

 leading off, observe not to deran^ie the indexes, and do not 

 leave it without seeina: that the indexes are in contact, and the 

 temperature that of the air at the moment. 



Of Thermometers buried iti the Earth, 



Thermometers buried at different depths, for the purpose of 

 examining the monthly changes of temperature of the soil, 

 should have their bulls and lower part of the scale well wrapped 

 up in woollen cloth or pounded charcoal, and should be placed 

 in strong earthen vessels, which may be entirely withdraw-n from 

 the ground so as to allow of inspecting and reading off the scale, 

 without exposing the balls to any possibility of changing their 

 temperatures while under examination. The vessels should be 

 fitted with covers, to defend the scale from injuring in burying 

 and d^gginpr up. 



A pipe of earthenware, (composed of separate pieces) or one 

 «f wood, may be sunk 10 or 15 feet below the surface, into dry 

 earth, and a thermometer defended as above, lowered by a efiam. 

 The pipe being then obstructed at every two feet, by some 

 stuffing readily hooked up, the thermometer may be easily 

 examined, and a register of its indications kept with very little 

 trouble. In like manner the temperature of wells may be 

 re^jisercd. 



Of the Temperature of the Sea. 



The surface temperature of the water at Sea should be 

 registered as a matter of course, with the same regularity and 

 at the same hours as the barometer and thermometer. It is 

 more conveniently (and with quite accuracy enough for the 

 purpose) obtained by taking up a bucket full of the water and 

 stirring round the lhe;momcter in it. Whenever a change to 

 the extent of 2"" Fahr. apjjears to have taken place since the 

 last observation, a fresh bucket full should be taken up and the 

 observation repeated It sho&ld also be noticed whether rain 

 lias fallen since the Inst observation. A sudden deprescion of 

 8 or 4* indicates the near approach of land. In a vovage from 

 England, lately made by a ftJcmber of this Committee, the 

 temperature of the surface wafer fell at once '.)° Fahr. on 

 approaching within a fev/ miles of the entrance of Table l?ay. 



The tcmperatuie of the sea at considerable depths, can 

 hardly be regarded as a subject of ordinary raeteorcdogical 

 icqniry and regular registry, thongh nudoabtedly one of much 



