APPENDIX. 



METEOROLOGICAL OBSERVATIONS IN BEHAR, AND IN THE VALLEYS 



OE THE SOANE AND GANGES. 



Most of the instruments which I employed were constructed by 

 Mr. Newman, and with considerable care : they were in general 

 accurate, and always extremely well guarded, and put up in the most 

 portable form, and that least likely to incur damage ; they were 

 further frequently carefully compared by myself. These are points 

 to which too little attention is paid by makers and by travellers in 

 selecting instruments and their cases. This remark applies particu- 

 larly to portable barometers, of which I had five at various times. 

 Although, there are obvious defects in the system of adjustment, and 

 in the method of obtaining the temperature of the mercury, I found 

 that these instruments invariably worked well, and were less liable 

 to derangement and fracture than any I ever used ; the best proof 

 I can give of this is that I preserved three uninjured during nearly 

 all my excursions, left two in India, and brought a third home myself 

 that had accompanied me almost throughout my journey. 



In very dry climates these and all other barometers are apt to leak, 

 from the contraction of the box-wood plug through which the tube 

 passes into the cistern. This must, in portable barometers, in very 

 dry weather, be kept moist with a sponge. A small iron bottle of 

 pure mercury to supply leakage should be supplied with every baro- 

 meter, as also a turnscrew. The vernier plate and scale should be 

 screwed, not soldered on the metal sheath, as if an escape occurs in 

 the barometer-case the solder is acted upon at once. A table of 



