THERMOMETRICAL OBSERVATIONS. 311 



The obfervations being now brought to a clofe, I have 

 only to add, that they were made, and regiftered with 

 fidehty, and corredly copied from the original entries 

 in my journal, without a fingle alteration. — The errors of 

 the clock, with its rate of going, as entered at the end 

 of each courfe of obfervations, may readily be examin- 

 ed by the equal altitudes and other obfervations made 

 for that purpofe : and for fear miflakes might happen, 

 in reducing the obfervcd time of an obfervation for the 

 longitude, to either mean, or apparent, the original entry 

 OS noted at the clock, has in all cafes been retained ; — fo 

 that any refult, which depends upon an accurate know- 

 ledge of the time, may be re-examined, and corredled if 

 found erroneous. 



It is prefumed, that no apology will be necellary, for 

 any fmall inaccuracies which may be difcovered in the 

 aftronomical obfervations, \\ hen it is confidered that they 

 were made at temporary ftations, and the apparatus fre- 

 quently expofcd to the v\-eather, for want of tents, and 

 other covering; and almort as frequently fo injured by 

 the tranfportation from one place, to another, through 

 the wildernefs, that if I had not been in the habit of 

 confl:ru£ting, and making inftruments for my own ufe, 

 our bufinefs mufl: have been feveral times fuipended, till 

 the repairs could have been made in Europe. 



S f 2 No. 



