MR. H. F. BLANFORD ON THE WINDS OF NORTHERN INDIA. 
653 
Description of the Plates. 
Plates XLXXI. to XLYIII. show the mean distribution of temperature and pressure 
in Northern India in each month of the year. The isobars are represented by thick 
lines, corresponding to even twentieths of an inch. The value of each is noted against 
the line, and the sign -f- and — indicates the directions in which the baric gradient rises 
and falls. The isotherms are represented by thin lines, corresponding to equal increments 
of 5° Fahr. 
The charts are based on the data given in Tables III. and VIII., with some additions 
in certain cases (see note, p. 585). Owing to the absence of barometric data for the 
Punjab, Assam, and Bombay, the isobars cannot be traced in those provinces. 
Plate XLIX. shows the average distribution of the total annual rainfall in Northern 
India, by means of ishyetic lines, each of which corresponds to an increment or decre- 
ment of 10 inches. The chart is drawn up from the data given in Table VI. It does 
not pretend to show minor local variations, nor to give the details of distribution where 
the annual rainfall exceeds one hundred inches. The stations enumerated in Table VI. 
are indicated on the chart by Roman figures corresponding to those of the Table. 
The principal characteristics of distribution according to season are indicated by 
inscriptions on the chart. 
