Vegetable Stanch. 6$ 



mometers ; and with tinged fpirit of wine 

 in them , to the fame height, as in each 

 correfponding Thermometer > the fcaie of 

 degrees, of each Thermometer , being mark- 

 ed on a Aiding ruler, with an index at the 

 back of it , pointing to the correfponding 

 tube. When at any time an obfervation is 

 to be made, by moving the index, to point 

 to the top of the fpirit in that tube, an ac- 

 curate allowance is hereby made, for the 

 very different degrees of heat and cold, on 

 the ftems of the Thermometer s, at all depths 1 

 by which means the fcale of degrees will 

 {hew truly the degrees of heat in the balls 

 of the Thermometers, and confequently, the 

 refpe&ive heats of the earth, at the feve- 

 ral depths where they are placed, The ftems 

 of thefe Thermometer s y which were above 

 ground , were fenced from weather and in- 

 juries, by fquare wooden tubes 5 the ground 

 they were placed in was a brick earth in 

 the middle of my garden. 



July 30. I began to keep a regifter of 

 their rife and fall. During the following 

 month oiAugufty I obferved that when 

 the fpirit in the Thermometer numb. 1* 

 (which was expofed to the Sun) was 



about 



