1^2^ Plan of a Meteorological Chart. 



column of months, of which they are of the fame temperature.' 

 Perhaps it would be of ufe to have three columns, inltead of 

 one, for the thermometer ; one to receive " the mean of the 

 mornino- obfervations, the other the mean of the afternoon 

 obfervations, and the third the mean of the two others. In the 

 fame manner, dotted lines are to be drawn, to fliew at what 

 times any of the phenomena of vegetation occur at different 

 places. The neceffity of this diflinftion arifes from the circum- 

 fhance, that the thermometer and vegetation do not exaftly 

 keep pace with each other. 



Farther to illuftrate the ufe of this chart, let it be required 

 to find what time at Williamfburgh correfponds in temperature 

 with the firft of May at New- York. In the perpendicular line 

 of New-York, take that point which is oppofite to the firft of 

 May, and from thence, follow the direction of the black curve 

 lines, till you interfeft the line of Williamfburgh, and the place 

 in the column of months to which you are oppofite, will exprefs 

 the required time. Again, let it be required to find when wheat 

 is ripe at Williamfburgh — In the column of remarks fee the 

 figure, annexed to that remark, which exprefles the day of the 

 oppofite month ; and from that part of the month, follow the 

 direftion of the dotted lines, till you interfed the line of WiU 

 liamfburgh, and the time will be fiiewn in the column of month 

 oppofite to it. 



It is a fa8; well known, that the weftern parts of this country 

 do not correfpond in climate, with thofe lying in the fame 



