2 
HINTS TO TKAVELLEKS. 
in camp, much importance attaches to regular observations made 
every two hours, from which the diurnal changes of climate may 
be ascertained. 
4. Special meteorological researches . These usually demand special 
instruments and skilled observers. They naturally vary with the 
nature of the locality, e.g ., exact measures of radiation in deserts, 
of rainfall in forests and on adjacent open ground, of temperature 
during land and sea breezes, or of such conditions as fogs, thunder¬ 
storms, tornadoes, etc., in places subject to those visitations, are 
always of value. As a rule, however, the traveller cannot be 
expected to devote much time to these matters, unless the study of 
physical geography is the object of his journey. 
5. The collection of existing meteorological records . It sometimes 
happens that at outlying stations meteorological observations have 
been taken and recorded for a considerable time. If they have not 
been already communicated to some meteorological society, the 
traveller should obtain a copy of them, and also compare the in¬ 
struments in use with his own. lie might indirectly aid in 
securing a knowledge of local climate by inducing residents at 
outlying stations to start regular observations. 
The first two ways of advancing meteorology need alone be considered 
in detail; but with regard to all, it must be clearly understood that the 
value of the work is greater the more carefully the observations are 
made and recorded, and the more remote and less known the region. 
1. A Eecord of Weather. —The traveller who makes his journey 
for any other purpose than the study of physical geography would be 
wise to burden himself as little as possible with instruments, but to 
understand thoroughly and use faithfully the few he carries. In a rapid 
march many different climates may be traversed in a few weeks, and tho 
records of variation of weather so obtained could not have much value ; 
but when a halt of a few days or of a week or two is made, systematic 
observations become very valuable indeed. 
Non-Instrumental Observations. 
The first place must be given to non-instrumental observations, which 
may be made at any time on the march or in camp, and should always be. 
