Meteorological Observations. 263 
rhomboidal, oblique pyramids of seleniuret of iron of a dark grey co- 
lour: the iron was dissolved in muriatic acid, and the black selenium 
was precipitated. 
I take profit of this opportunity to let you know that the Herrerite 
is not a carbonate of tellurium, as it was announced by my pupil, but 
of zinc and nickel, which gives to it the pretty pistachio and grass- 
green colour: it contains also some cobalt ; and the apple-green, 
fibrous, and very soft substance, which accompanies it, and I sup- 
posed erroneously to be a species of the preceding, shows to be at the 
blowpipe an arseniate of nickel. 
As soon as I get some pieces of your Culebrite, I will examine it, 
and give you notice. 
ANDREA DEL Rio. 
METEOROLOGICAL OBSERVATIONS FOR JANUARY 1836. 
REMARKS. 
Chiswick.— January 1. Snow. 2. Severe frost: slight snow at night. 
3. Thawing: cloudy and fine. 4. Cloudy: stormy. 8. Hazy: fine. 
9. Frosty. 10. Stormy, with some snow. 11. Overcast: heavy rain. 
12. Sharp frost : clear and calm. 13. Frosty : cloudy. 14, Cloudy and 
windy. 15. Heavy rain: clear and windy at night. 16,17. Clear and 
frosty. 18.Cloudy and cold. 19. Fine. 20. Frosty haze: overcast. 
21. Fine: clear. 22. Slight rain. 23. Boisterous. 24—26. Very fine. 
27. Fine: stormy at night. 28. Fine: slight rain: windy. 29. Cloudy and 
cold. 30.Clear and frosty: fine but cold. 31. Rain. 
The plan which is followed in regard to the meteorological observations 
made at the Garden of the Horticultural Society, is in accordance with 
that recommended by Professor Daniell in his excellent Meteorological 
Essays. A full account of the instruments employed is given by Mr. Booth 
in yol. vii., p. 97, of the First Series of the Hort. Soc. Transactions. It will 
be proper, however, to mention such circumstances as are connected with 
the abstract which appears in the Phil. Mag. and Journal of Science. 
The barometer is situated about fourteen feet above the mean level of 
the Thames, at Chiswick. The observations are taken at 8 a.m., 1 p.m., 
and 10 .m. A correction is made for every observaticn for the capacity 
of the cistern, the neutral point of the barometer, and the temperature of 
the mercury; so that the column of mercury is reduced to that which, at 
a temperature of 32°, would balance the atmosphere. The thermome- 
ters indicating the mar. and min. of temperature are self-registering, and 
of Rutherford’s construction; they are placed in an open space in the 
Arboretum, and are protected from the rays of the sun by a sort of um- 
brella of painted canvas. They are attached to the post which supports 
the umbrella, a little below the level of the margin of the latter, and about 
four feet from the ground. 
The rain-gauge is made according to Mr. Howard’s directions, in his 
work upon the Climate of London. ‘The quantity is registered every morn- 
ing, when there is any, at 8 a.m. The direction of the wind is noted at 
] P.M. 
Boston.—January 1, 2. Cloudy. 3. Cloudy; rain p.m. 4. Cloudy. 
5.Fine. 6. Cloudy. 7, 8. Fine. 9. Cloudy. 10. Cloudy: snow p.m. 
11,12.Cloudy. 13.Fine. 14. Fine: snow melted: stormy night, with 
rain, 15. Fine:rainr.m. 16,17. Fine. 18. Cloudy: rain p.m. 19. Fine. 
20,21.Cloudy. 22, Cloudy: rain p.m. 23. Stormy. 24. Fine: rain p.m. 
25.Foggy. 26.Cloudy. 27.Fine. 28. Fine: rain p.m. 29, Fine: snow 
A.M. 30. Cloudy and stormy: snow a.M. 31. Snow. 
