Intelligence and Miscellaneous Articles. 155 



living and Pliocene and Pleistocene species (except Etruscus) belong 

 to the hypodont section. We have therefore to compare R. 

 Etruscus with Miocene rather than with Pliocene and Pleistocene spe- 

 cies. It differs from the Rhinoceros of Auvergne principally in the 

 greater complexity of its anterior valley and the larger development 

 of the posterior combiny -plate. Its nearest ally is the hornless Rhi- 

 noceros of Darmstadt, the Acerotherium incisivum of Kaup. 



R. Etruscus has been found associated within, megarhinus, but not 

 with R. tichorhinus nor R. leptorhinus. 



It has not been found with any animal (except the Mammoth) 

 fitted for living in a severe climate, nor in any deposit of postglacial 

 age. 



XVIII. Intelligence and Miscellaneous Articles, 



ON STELLAR SPECTRA. BY FATHER SECCIII. 



1 N my memoir on stellar spectra, published in the Memorie delta 

 ■^ Societd Italiana, I have observed that the three principal lines of 

 hydrogen coincide with the dark lines of the white stars of the first 

 type, like a Lyra?, Sirius, &c. 



Yet the identity of these lines was only certain in the case of the 

 greenish blue (the line F), and very probably in that of the violet. 

 That of the red (Ha) could not be confirmed, owing to the small 

 intensity of the light at this end of the spectrum. This was a defect 

 which needed to be remedied. 



On my return to Rome I endeavoured to improve the simplified 

 form of the direct- vision spectroscope ; and having observed that the 

 ordinary eyepieces, owing to their magnifying in all directions of the 

 field, diminish too much the intensity in the red, I tried a cylindrical 

 eyepiece. It consists of an achromatic cylindrical lens with a focal 

 length of about 7 centims., which I substituted for the ordinary eye- 

 piece in my simplified spectroscope. 



The result was most surprising. This lens retains a remarkable 

 power even at the extremities of the spectrum ; and I could immedi- 

 ately observe the dark line of the red Ha in its place in the stars 

 a Lyrse, a Pegasi, Algol, and in several other stars of the first 

 magnitude. 



By way of confirmation, I was desirous of seeing y CassiopesD, in 

 which the bright lines occupy the place of the dark ones, as I have 

 formerly shown. In fact I could see the bright-red ray stand out 

 on the very feebly luminous ground. It is curious that with this 

 eyepiece the bright line /is less distinctly seen ; but that is expli- 

 cable from the great light of the whole of the greenish-blue space on 

 which this ray is projected, and which, being greatly strengthened, 

 prevents the ray from standing out. The observation of Mr. Hug- 

 gins on this ray is thus confirmed, he having in turn confirmed my 

 discovery of the bright line F in the spectrum of this curious star. 



If the fine weather continues I hope I may be able to extend these 

 observations. I ma}?- add that o of the Whale, which is now of 

 almost the third magnitude, exhibits a magnificent spectrum of the 

 third type, resembling in beauty that of /3 Pegasi and a Ononis, and 



