Norwich Castle Museum. 171 
Copenhagen like that in this collection. Both have 
perforated rims, and an extremely brittle reflecting 
surface, the metallic compound of which the reflect- 
ing disc is composed is known as speculum metal, 
and ‘‘the disc of a reflecting telescope is apparently 
identical in its combination with the face of the 
Caister mirror.” The figure of Bacchus is easily 
recognisable from its holding a bunch of grapes. 
There will also be seen in this collection a Roman 
iron key of a common type; a phallus in bronze, like 
JEWELLED FIBULA FOUND AT SWAFFHAM. 
| Norfolk Archeology, Vol. V., pr. 354- 
those found in France ; a cock in bronze; and various 
descriptions of fibula or brooch. The coins found at 
Caister in association with these antiquities cover a 
period extending from the first to the fourth century. 
Geta, whose bust in bronze is here produced, was the 
younger son of the Emperor Severus, who, with his 
brother Caracalla visited Britain, and who was 
subsequently poniarded by Caracalla in the arms of 
his mother. 
