414 Scientific Inielligence. 
EXPLANATION OF PLATES. 
Plate 1v.—Figure 1, Nothria opalina V.; head and anterior part of body. 
Figure 2, Lwmbriconereis fragilis; head and anterior part of body. : 
Figure 3, Ninoé nigripes V.; one of the appendages from the middle 
part o: y. 
Figure 4, Nephthys ciliata; one of the appendages. 
Figure 5, Phyllodoce catenula V.; head, anterior part of body, and 
proboscis. 
igure 6, Stephanosyllis picta V.; head, anterior part of body, and 
All the figures were drawn from nature by Mr. J. H. Emerton, except fig. 4, 
plate Iv, which was copied from Ehlers; all are much enlarged. 
SCIENTIFIC INTELLIGENCE. 
J. CHEMISTRY AND PHYSICS. 
ence proved that changes took place in the relative intensity of 
Now it is well-known that, as the 
experiments in a table in which the day (and time of day), the 
sun’s height, the time of exposure and the state of the barometer 
and psychrometer, are given. On the 7th of October, at 2 P. M- 
the photographic activity of the spectrum extended from a point 
midway between © and D to considerably beyond H. On the 
17th, at 2.30, it reached from a point short of D to a point nearly 
Jt. On the 18th, from a point midway between C and D, to a 
point considerably short of H. On the 29th, from beyond B to a 
