186 Scientific Intelligence. — Zoology, 
when, in the evening, from seven to eleven o’clock, a continuous 
band of these living globes of fire passed near our vessel. With 
the light which they diffused, we could distinguish, at a depth 
of fifteen feet, the individuals of Thynnus pelamys^ and Sarda., 
which have followed us these several weeks, notwithstanding 
the great celerity with which we have sailed.” 
SI . Notice regarding Two Eggs contained one within the 
other y and without Yolks^ hy M. Durance . — If it sometimes hap- 
pens that eggs contain two yolks, we also find that others contain 
none. The hen which had the crop torn, and of which mention 
is made in the Bulletin General^ and which lived without a cock, 
has laid thirty-seven eggs from the 6th February last, to the 
S6th March. On the S8th, it laid one which was a little smaller 
and more elongated than the others. This egg having been 
opened, was found to contain only albumen ; and, in the place of 
the yolk was found a small egg, very well formed, of the same 
size as this latter. The shell was soft, and contained itself no- 
thing but albumen . — Bulletin Universel. 
22. Musical Thrush of Brazil . — ‘‘ We first observed in these 
woods the notes of a greyish-brown bird, probably a thrush, 
which frequents the bushes and ground in damp low woods, and 
sings with numerous repetitions through the musical scale, from 
HI to (of the German scale), so regularly, that not a single 
note is wanting. It commonly sings each note four or five times 
over, and then proceeds imperceptibly to the following quarter 
tone. It is usual to deny to the songsters of the American fo- 
rests all melody and expression, and to allow them no pre-emi- 
nence but splendour of plumage. But if, in general, the pretty 
natives of the torrid zone are more distinguished by the beauty 
of their colours than by fulness and power of note, and seem 
inferior to our nightingale in clearness and melodiousness of 
tone, yet this little bird, among others, is a proof that they 
are at least not destitute of the principles of melody. How far 
the musical improvement of man has already had an influence 
on the notes of birds, remains an interesting subject for physio- 
logical investigation. It is at least inconceivable, that when the 
almost inarticulate tones of a degenerate race of men no longer 
resounds in the woods of Brazil, many of the feathered song- 
