On the Phosphorescence of Marine I nvertebrata. 71 
splashing occasioned a scintillation like that of a bar of iron at a 
white heat when struck upon an anvil. The entrance of a steam- 
boat when the phenomenon was most apparent, was a magnifi- 
cent sight, and recalled to mind the descriptions of travellers. 
he “ Pare aux huitres” was always bordered by a phosphores- 
cent girdle, resulting from the incessant undulations of the sea, 
which reached the shore under the form of small waves; but in 
perfectly fair weather this light was too feeble to be distinguished 
ata distance. When these undulations were only three to four 
inches high, the ring might easily be seen from the pier, through- 
out its whole extent, and was especially marked in the inner 
part of this little harbor. 
t Boulogne, as at Stromboli, these luminous waves seen from 
adistance, presented a uniform tint of a pale dull white. It might 
be called almost a froth, resulting from the action of the waves 
against the shore ; and seen at mid-day under the most favorable 
circumstances, that was all I could distinguish ata distance of 70 
to 80 yards. In proportion as you advance the appearance 
