60 
Remarks on the recent Conference at Vienna on 
This resolution is self-evident, and the only remark which 
is called for is an explanation of the term Hydrometeors, which 
is employed in Germany to denote all the phenomena connected 
with the presence of water, in any form, in the atmosphere. 
E. 2. '• Conversely, the meteorological elements appear to exhibit the 
influence of vegetation in the following ways : 
" Vegetation on a large scale (such as pasturage, tilled land, forests, moor- 
laud, &c.) gives rise, in each several district, to special conditions of tempera- 
ture and atmospheric humidity, and perhaps of rain also, and may therefore 
exert an influence on the climate of the surrounding country in respect of 
temperature and hydrometeors, and also in respect of the springs." 
This Resolution assumes the possibility of dealing with ex- 
tensive tracts of country on similar principles, as will be seen 
further on, when we come to treat of the subject of Parallel and 
Radial Stations. 
Question II. 
To what observations of meteorological elements is particular attention to he 
paid with especial reference to their influence on vegetation f 
R. 3. " On the whole, it appears important that, on as many rationally- 
managed estates as possible, special observations should be carried on of all 
the elements recognised as important. 
" These observations should be made in different soils, and with different 
types of culture, and should be compared with the crop-returns, year by 
year, so as to investigate in detail the relation between the vegetation and 
the climatic factors. 
" The general mean results published by the several central meteorological 
offices do not furnish values in sufficient detail for the study of individual 
types of culture, or of local conditions." 
II. 4. " The Conference approves of Dr. Hann's proposal that the Govern- 
ments and the agricultural societies be recommended to set on foot such 
organisations of statio!is for the study of agricultural meteorology as shall , 
render it possible to ascertain the conditions of climate required by the most 
important crops, not only in the region where they reach their highest 
perfection, but also at the extreme limits of their cultivation." 
It appears that the operations contemplated in these paragraphs 
are of such a nature as might be conducted in this country at 
large establishments dealing with extensive acreage. The ex- 
periments are such as have been conducted for many years with 
great success at Rothamsted. 
With reference to the latter part of Resolution 3, it is uni- 
versally admitted that the average results published in ordinary 
meteorological tables are not sufficiently detailed to throw light 
on the influence of weather upon agriculture, for the effect must 
vary with the nature of the soil, the lie and aspect of the land, and 
its height above the sea, and with the character of the cultivation 
employed. Moreover, the means should be published for shorter 
intervals than months, say for five-day periods, or even for single 
days. 
