306 Journal of the Asiatic Society of Bengal. { Aug.-Sept., 1913. 
observations Seti in his papers on anemographical records 
published in 1910, seem to represent the entire literature on 
the subject. An sirtatoatang project to investigate them more 
thoroughly appears to have been discussed several years ago, 
but it fell through upon, I believe, the death of the scientist 
who made the proposal. Sir John Eliot’s papers contain a 
wealth of statistical detail with respect to accompanying baro- 
metric and wind changes. But there is practically no discus- 
certain specified conditions of the barometric gradient, at the 
intersection of the wind streams down the Ganges and Brahma- 
putra valleys. And there the matter has been left 
To the observer, however, who is interested in watching 
these brief storms, two features ‘will gradually attract attention. 
The first is that a storm on one night will very often be followed 
in the two succeeding evenings by similar but much teebler dis- 
turbances, showing that the large displacements of air and 
the shifting of temperatures have not altogether obliterated cer- 
tain fundamental conditions which gave the storm its particular 
while those of the following year will exhibit a similar family 
resemblance to one another in the same year but not to those 
in the preceding year. One year will produce a series of the 
typically complete nor’ wester with its double line of clouds and 
the lightning occurring after the heavy rain cloud has arrived, 
while another year—such as the present—will me heavy 
lightning for some time before the wind-storm has arriv 
rom this annual grouping of storm types there peo at 
once the probability that careful investigation may show a 
direct relation between the nor’wester type and the character » 
of the following monsoon. 
It is obvious that the cloud form in a nor’ wester is due 
to two main sets of influences—the alterations in pressure gra- 
dients in surrounding territory and the nature of the upper 
air-currents into which it penetrates. Its form can be seen: 
