268 
Scientific Intelligence, [no. 2, new series, 
night ; the highest nightly rise being at 10 p. m. and the lowest 
descent at 15/?.. or 3 a., m. : the daily range being on an average 
0*120, and that during the night about half as much. The varia- 
tions in the times or range between the different months is very 
trifling, but the mean value for each month shows considerable alter- 
ations ; the mercury standing highest on the average in January, 
falling gradually until June, and rising again from July to Decem- 
ber, the rise being usually, but not always, most rapid from October 
to November. The same general course is also visible, though sub- 
ject to great fluctuation, in the curve of daily means at the foot of 
each Barometer Plate, where are shown the successive changes in 
the mean height of the mercury from da^ to day. In most of the 
years there will be seen one or more considerable depressions about 
the beginning of November, indicating the effect of the storms which 
so frequently occur about that time. 
The Thermometer curves have rather a peculiar form ; that por- 
tion which belongs to the day, viz. from 18^. to 6/«., having nearly 
a parabolic shape, while the night portion scarcely differs from a 
straight line, showing a nearly uniform descent from sunset to sunrise* 
the change from the night to the day being much n?ore abrupt than 
the converse. The coldest time of the 24 hours appears to precede 
that of sunrise by a few minutes ; the hottest time is about \h. 10/w. 
p. M., but varies in the different months from 0/^. 30m. to 2h. June 
is on the whole the hottest month but is nearly equalled and in one 
year surpassed by May. The coldest month is January, but De- 
cember and February differ but little from it. The range of tem- 
perature is seen to be much greater in the hot than in the cold 
season, the least occurring in November. The mean daily range 
amounts to 12^. 
New species of Silk Worm. 
"The Agri-Hoeticultural Society of India has reported 
most favourably on a new variety of silk, brought into notice by 
Capt. HuTTON, of the invalids, a resident of Landour. The worm 
which produces it (Bomhyx HuttoniJ spins in all weathers, whereas 
the common silk- worm is apt to be thrown off work by a passing 
