182 Researches on Solur Physics. 
10. Willow-leaves.—-We may be allowed to mention here that 
very lately Mr. James Nasmyth, during the course of his obser- 
vations of the sun’s surface, has come to the conclusion that, 
ous bodies, of a ene similarity of “igor interlacing one an- 
other; and he has gi e name ow-leaves to these ap- 
nees, 
of our best observers in this country have seen them under very 
favorable atmospheric nee and they have been seen more 
fren eney by Secchi and other Ttalian observers 
1. Other rennet of the sun’s surface, —Chacornac, the emi- 
sola hea observer, has noticed a behavior of those portions 
seem less brilliaiit than any portion of the penumbra. oe the 
and a portion of the umbra between it and the penumbra ap- 
peared to be veiled with a stratus cloud evolved out of it. 
e ought likewise to mention the excellent and numerous 
observations of Pastorff, preserved in the library of the Royal 
Astronomical Society, also those of Captain Shea, both of which 
the Council of that Society have placed at our disposal. Pro- 
fessor Wolf, of Zurich, has collected data for weg ee the 
periodicity of sun-spots before the commencement of Schwabe’s 
observations, Also, the Rev. J. Howlett, in ‘his country, has 
roduced a large series of drawings of the sun’s surface on & 
of Kirchhoff and Bunse , by means of the sche 
have proved that many milan substances, such as 
iron, magnesium, &c., exist in the atmosphere of our emae™ 
in the state of vapor. 
§ Ill. Materials at the author's disposal. 
13. We now proceed to describe what materials we have at 
our disposat for the purpose of these investigations. 
In the first place, Mr. Carrington has very kindly put into 
