1863] SCIENTIFIC INTELLIGENCK 



Monthly Meteorological Register, at the Provincial Magnetical Observatory, Toronto, Canada West.— June, 1853. 

 Latitude 43 dec/. 39.4 miii. North. Zovciitude, 79 de.g. 21 min. West. Eleiialion above Lake Ontario : 108 feet. 



285 



Smn of the Atmospheric Current, in miles, resolved into the four Cardinal 

 directions. 

 Norlh. West. South. East. 



985.62 876.95 798.80 831.68 



Mean velocity of the wind - - 3.67 miles per hour. 

 Maximum velocUy - - - - - 18.3 mi's per h'r, from S to 9 p.m. on 3rd. 

 Most windy day - . - . .23rd: Mean velocity, 7.9S miles per hour. 

 Least windy day ----- 2Slh: Mean velocity, 1.65 ditto. 



The colunm headed "Magnet" is an attempt to distinguish the character 

 of each day, as regards the Ireqnency or extent of the Iliictuations of the 

 Magnetic declination, indicated by the self-registering instruments at Toronto. 

 The classification is, to some extent, arbitrary, and may requii-e future 

 modification, but has been found tolerably definite as far as applied. It is as 

 Ibllows:— 



(a) A marked absence of Magnetical disturbance, 



ij/) Unimportant movements, not to be called disturbance, 



(c) Marlced disturbance — wnether shewn by frequency or amount of 

 devialion from the normal curve — but of no great importance. 



(rl) .A grcaler degree of disturbance — but not of long continuance. 



(«) Considerable disturbance — lasting more or less the whole day. 



(/■) A Maguetical disturbance of the first class. 



The day is reckoned from noon to noon. If two letters are placed, the first 

 applies to the earlier, tlie latter to the later part of the trace. Although the 

 Declination is particularly referred to, it rarely happens that the same tei-ms 

 are not applicable to the changes of the Horizontal Force also. 

 Highest Barometer - - 29,982,at 6 A.M.,on 12ili. > Monthly range: 

 Lowest Barometer - - 29.265, at 4 P.M., on 23d. S 0.717 inches. 



Highest observed Temp.- 89.5, at 2.45 P.M., on 13th \ Monthly rana-e: 

 Lowest regist'd Temp. - 39.2, at A.M., on 25th S 50.3 



Mean Highest observed Temperature - - 74.05 \ Mean daily range ; 



Mean Minimum Thermometer; 64.28 S 19.77 



Greatest daily range - - - - -32.S from noon of 23rd, to A.M. of 24lh. 

 Warmest day - - 14ih - - - Mean Temperature - 75.22 } Difference : 

 Coldest day - - - 25lh - - - Mean Temperalure - 51.48 J 23.74 



The "Means" are derived from si-x observations daily, viz., at 6 and Sj 

 A. M,, and 2, 4, 10 and 12, P. M. 



Comparative Tabic Jor Jasie 



This montli lias been distiDguishcd not only by great dryness — the 

 amount of rain fallen being the least in the corresponding series of 13 

 years — but also by excessive variability of tenijicrature on particular 

 days above and below its normal value. It will be seen by reference 

 to the comparative table that the mean of the whole montli is the 

 highest linown since the year 1841 ; and the maximum temperature is 

 only exceeded by 1841 and 1848, while the minimum is just at its 

 average value, so that the range, which is excessive, lies wholly towards 

 the high temperatures. The variations on particidar days will be seen 

 by the following table, whichgives the difference of the mean tempera- 

 ture of each day above or below the normal temperature of that day. 



June. 



9 I 101 IMISI 13 I 14 I 13 I IB I 17i ISiWI 21) I m a2| i3| •.i4 I 



-O.ll s"Ig.2|i.4U.3|o.oI7.tI.1.oI sll0.5l].t4l l3.9ll2.oi5.5|3.4| sll2.3l5.3l7.9l.5.4U.3l-12.ll Sl-T.G l-O.ilk 



The group of hot days from the 13th to the 1 6th has never been 

 equalled, and the group of cold days from S-lth to 2Sth is also remark- 

 able. 



Fine display of Aurora on June 1st, accompanied by a perfect arch, 

 stretching about N. W. and S. E., with its vertex a few degrees south 

 of the Zenith. Possible to see Aurora on 25 nights ; Aurora actually seen 

 on 4 nights. 



At 12.30 P. M. on 23rd, a lunar halo was scon, inner radius 23 ^ 30'; 



its inner rim shewed comparative darlcness, being well defined: apar- 

 aselena appeared on its western edge, throwing out a tail from tho 

 moon, and haying the same altitude as the moon. Shortly afterward 

 another appeared at the same distance on the Eastern side, with an 

 arch of a horizontal circle passing through the moon, at whose intersec- 

 tion with the lialo the paraselena was formed. This latter exhibited 

 tlie prismatic colors, red on the inside, light-grceu on the outside, and 

 threw a tail from the moon along (he horizontal circle. 



