308 Proceedings of the Royal Physical Society. 
undulations (set up mainly by luni-solar gravitational energy) 
into the energy of heat ? 
2. Is it certain that radiant energy in general differs 
from gravitational energy in operating only between two 
solid bodies? If radiant energy acts only between any two 
material bodies, how do we know that the radiant energy of 
the sun, or the heat of the earth, is being dissipated into 
space at anything like the rate which is generally assumed 
to be the case ? 
XXII. Some Additions to the List of Spiders collected in the 
Neighbourhood of Edinburgh. By GEORGE H. CARPENTER, 
B.Sc., and WILLIAM Evans, F.R.S.E. 
(Read 15th April 1896, and revised for publication 1st October. ) 
Since the publication of our list of Edinburgh Spiders 
about two years ago (Proceedings Royal Physical Society, 
xi, pp. 527-590), we have—though not paying special 
attention to the group—obtained a few species not hitherto 
known to occur in the district, besides discovering additional 
localities for some of the less common kinds already 
recorded: these it may be well to place on record now.! 
There are also some changes in nomenclature to notice; 
and we regret that through an error in identification one 
species (Walckenaéra obtusa, Bl.) must, for the present at 
any rate, be withdrawn. 
The additional species, which for convenience we shall 
enumerate first, are five-in number, making—with the 175 
in our original list, less the one now cancelled—a total of 
179 recorded for the neighbourhood of Edinburgh up to the 
present time. The names of the five are :—Cnephalocotes 
interjectus, Cambr., Hpeira cornuta (Clk.), Epeira umbratica 
(Clk.), Zibellus oblongus (Wlk.), and lurops “insignita 
(Clk.), the first and last being new to Scotland: indeed, the 
1 As before, the field-work has been done entirely by Mr Evans. 
? We confine ourselves at present to a few generally accepted changes in 
specific names, 
