72 Scientific Intelligence. 
guished: (1) That of its cae tye (2) That ofa eae period 
of relative calm. (3.) of its closure and exti the 
rst the metallic eruptions ocr their maximum vio iat orti- 
cal motion on an e us scale is sae both in the ahbtoanhons 
and in the chromosphere in the former (to borrow an architec- 
tural term) iz plan, in the latter in mn elevation. These vortical 
motions are a conse uence, not a cause—products of the eruption, 
admittedly associated with the spot, but not pecaanie of it. (It 
is this period which Mr. Langley has taken as the subject of his 
sky of Rome, in the days preceding and following those em- 
ployed in = study at ies ge 
In the second phase the spot commonly presents a crater-like 
formation, an a frit central mass being invaded by convergent 
gaseous streams, which form the luminous bridges and filaments. 
though new matter, still extruded, ¢ ecks the invasion of the sur- 
rounding photosphere, and stegiiaiee with its insetting currents, 
causes the radiate appearance of the penumbra. This s phase may be 
being discharged without tumultuous outbursts, or the formation 
of the pine of smoke. 
In the third — — a ~ terrestrial and solar volcano, the 
emission ceases all is 
nid 
—— matter, ere Mr. Langley mistakingly assumes Father 
Secchi to suppose it to be in, generally. M. Faye and he have 
attacked Father Seechi from fe sear ae not perceiving that 
admitted to have carried. the palate ‘of photospheric detail 
farther in some respects than he has been able to do, with the 
smaller pooh of the Roman instrument. 
s impression that the observations he brings do 
not accord axl ] with Father Secchi’s views, is altogether owing to 
she pie 8 of the true nature of these; on the contrary, “the 
article and illustration bring gratifying and remarkable confirma- 
