Zoological museum, thing. 
47 
cases, together with casts of its egg. This case 
contains, in addition to the 
Auks and Guillemots, the Penguins, Albatrosses, 
Gannets, Cormorants, Skuas, Gulls, and Terns. 
Of the Penguins the enormous Emperor Penguin 
{Aptenoclytes forsteri) is worth special attention, and 
among the Auks and Guillemots we see a black variety 
(melanism) of both the Razor-Bill (^Alca torda) and 
the Common Guillemot {^Uria troile). 
Returning through the centre ^ passage to the 
entrance, we see in front — a little to the left — a glass 
case with 
Nests. 
This is still in preparation, but it will contain, or 
contains already, most of the different types of nests. 
The simplest method is to merely lay the eggs on the 
bare rock (Guillemots), then a little impression is 
used or made in the sand or soil, in the next stage this 
is lined with some grasses or leaves. A more advanced 
form is then the nest of the Wood-Pigeon, consisting 
of sticks laid across some branches or twigs ; then the 
nest becomes thicker, softer, until the beautifully soft 
woven nest of the Chaffinch and others is reached, 
while the Thrushes plaster it out with mud or clay 
and decayed wood. This is the beginning of the 
plastering, which is more developed in the Swallow 
