This chart is divided vertically into thirteen months in orderito include, theikst month of the following year. Each month is further divided, 

 by the lighter lines, into periods of isix days each, except in the case of those months having fewer or more days than 30, when the lastvdivision 

 of the month may equal four, five, or seven days. The ist, 6th, 12th, i8th, 2^th and last days.of the month fall, on the vertical lines. The 

 transverse lines represent the stations, from which chey extend. A complete break in the isothermal line opposite any station generally indicates 

 that; the temperature did not reach tlieisotherm at.that station during the year, A line consisting of dashes denotes a. lack of observations for 

 the ccsrresponding smtiml. 



