446 Miscellaneous Intelligence. 
the Nov. 13th-14th period is not visible in Australia, according to Pro, 
Newmeyer ; but those of Aug. 9th—-10th, with other periods, are. 
In addition to the above, Mr. Greg has commenced an extract from 
tories, and Hawkhurst ; it giv ves the heights, paths, brilliancy, directions, 
and estimated mass of twenty observed meteors of that period. Their 
average upper limit was 82.50 miles, and their average disappearance 
t 58 miles above the sea-level. The former heights varied from 55 
qlee at the lowest, to 131 miles at the highest ; the latter heights 
from 35 miles at the lowest, to 84 miles at the hi ighest. The paths varied, 
in absolute length, from 18 miles to 100 thiles, and averaged 47°5 miles; 
and the durations varied from half a second to three seconds, and the ve- 
locties range all the way from 23 miles to 71 miles a second. The radiant 
was near Gamma Persei. 
An attempt was also made to estimate the masses of the individual me- 
teors by the heat developed—taking the apparent light as its measure, 
and comparing the latter with the amount of coal gas which would yield 
is put at near one and a-balf pounds avoirdupois, varying from 20 grains 
to 74 pounds. 
It is scarcely necessary to remark here that this last determination must 
have required a large amount of assumption, and can be received only a 
an approximation of the rudest description. Even as such, pares it 
great interest and value. cians 
- 18. National Academy of Sciences—Titles of memoirs resik and ‘of 
oral communications sande at the January Session, 1864, at Washington? 
1. The elements of the mathematical theory ‘of quality. First Ne 
moir; a Perce. 
8. The Saturnian System. First Memoir; Bensamrn Per 
varieties an species ; a —o 
5. On the metamorphoses of Fishes; L. Aca their 
8. On the geographical dbaton ‘of Fishes as i bearing ups 
affinities and systematic classification ; L. Aas lege Ob- 
serv n the years 1840-45; Parts IV, V, VI. Horizontal Foree; 
investigation of the eleven year period of the solar diurnal aire al 
annual inequality, and of the influence of the moon. Abstract; A. © 
Bacue 
8. Discussion of Magnetic Observations, dc. ; Parts VI, Vill wth 1K 
Vertical a i investigation of the eleven year period od of the 
iation and annual inequality, and of the influence of the aga 
