PROCEEDINGS OF SOCIETIES. 283 
spirals where the existence of more or less double scales was obvious, he 
succeeded in establishing a general explanation applicable to cases 
where double scales were not present. 
SE : andis “On the 
Geographical Distribution of Forests in India." In all countries the 
character of forest vegetation mainly depends on soil, climate, and 
the action of man. In India the greater or less degree of moisture is 
graphical distribution of forest trees, if the amount of atmospheric mois- 
ture and the formation of dew during the seasons of the year in different 
war. Throughout this vast region, which covers an area equal to that of 
the king om of Prussia, with a population of from twelve to fifteen 
millions, the rains are not only scanty but most uncertain. is not a 
Sindh, for instance, the area of forest land en 
is under the exclusive control of the State, covers 350,000 acres, a 
situated on the fertile alluvial soil on both banks of the Indus, some 0 
ich i ods of this large river, the 
rown up are covered at once by a dense growth of 
of Tamarisk with a sprinkling here and — of the Aca pone 
and in other places large tracts of old forests are carrie 4 
Md of the river. Outside these forests a little further wlaud, 
