igS REMARKS ON METEOROLOGY. 



(in the centre of all the motions), with one of its surfaces as 

 nearly parallel as may be to the milled head m, is next ren- 

 dered truly parallel to the axis by turning the handle I till 

 the reflected image of a horizontal line is seen to be hori- 

 ■^Kintal. 



By means of the milled head /, the second surface is then 

 brought into the position of the first, and if the reflected 

 image from this surface is found not to be horizontal, it is 

 rendered so by turning the milled head m, and since this 

 ■motion is parallel to the first surface, it does not derange 

 the preceding adjustment. 



IX. 



Remarks upon Meteorology : with a Specimen of a new Me* 

 leorulogifal Table. By J. Bostock, M.D, 



T 



teorology of 

 great use, 



HAT part of he science of meteorology, which consists 

 Predictive me- \n r;iedicting the changes of the weather, is not only inte- 

 resting from its coniiection with the great operations of na- 

 ture, but is also in itself of obvious practical utility. It has 

 accordingly engai^ed the attention of many philosophers ; 

 and numerous a.tempts, some derived from hypothesis, and 

 others fourided upon supposed experience, have been form* 

 ed, to lay down a ;-et of rules, which might apply to the va^ 

 rious circumstances that present themselves. The tjasis of 



It must be these rules must be observation ; and it is from a conviction 

 founde.'l ou _ , . , , . .„ .,.,,. „ 



obseivatioi). of this truth, that many scientific men, in diHerent parts of 



the world, have assiduously employed themselves in forming 



what are called meteorological tables. But, I think, I may 



venture to assert, that the benefit derived from these tables 



^''•^ j'^"^^* of observations by no means corresponds with the trouble 



nieteorolvjfzical that has been bestowed upon them. After marking down 



tiii»Je> not )et tj^p lieiyht of the barometer and thermometer, noting the 

 answerable to . , „ . , . , , . . ^ . 



thtiir trouble direcLion and iorce ot the wind, and measurmg the quantity 



of ruin, tor years together, it does not appear, that the cb.f 

 server is in any degree enabled to detcmine, whether the 

 rje>:t day will be fair Or foul, calrp or stormy. On the con- 

 trary 



