258 FLORA INDICA. 



have not had access to any of them. Mr. Ritchie, a Bombay 

 officer, we believe formed a good herbarium in the mountains 

 south of Jellalabad (the Safed Koh), which Griffith appears to 

 have seen, but none of the specimens have found their way 

 into our herbaria. 



EXPLANATION OF THE MAPS. 



MAP I. — To face page 82 of Introductory Essay. 



The Map of Isotherm als for January, April, July, and Octo- 

 ber, is intended to illustrate the chapters of the Introductory 

 Essay devoted to the Meteorology of India (page 74), and of 

 the provinces into which we have divided that country (page 

 115). It is compiled (by permission) from the maps of 

 monthly Isothermals which accompany Dove's admirable work 

 " On the Distribution of Heat over the surface of the Globe," 

 as translated by Colonel Sabine, and published by the British 

 Association for the Advancement of Science. 



MAP II. — To be placed at the end of the Introductory Essay. 



The boundaries and names employed in the Map of India 

 divided into Provinces, have been partially explained at page 

 88 ; it remains to add a few words on om' representations of 

 its mountain and river systems. 



As regards rivers, we find these to be represented in most 

 maps as being equally numerous, and of as great volume, in 

 some of the most arid, as they are in the most humid pro- 

 vinces. This arises from the fact that the larger maps are in 

 many cases made up from local surveys, and their component 

 parts have hence no relative value. In an arid country like 

 K-ajwara, every streamlet carrying water for a few days in the 



