Implements and weapons of the Stone Age are being continually unearthed. Some are rough and include hammers, clubs, whorls for spinning, stones for pounding corn, whetstones, vessels for liquids. Others are polished, and show a great advance on the rough in workmanship. These include celts or axes of porphyry or serpentine, locally known as “thunderbolts” and held in veneration by the finder. Another polished weapon is the knife, said to be found only in Shetland. [Illustration: Sectional Elevation, Broch of Mousa] Gold, silver and bronze ornaments of the Viking Age are occasionally discovered—one of the most recent and beautiful a bracelet of gold in the isle of Oxna. [Illustration: Gold Armlet (Norse) from Isle of Oxna] Inscribed or sculptured stones are of two kinds—Celtic, and Norse or runic. Examples of the Celtic are the Bressay Stone, the St Ninian Stone, the Lunnasting Stone, with Ogham inscriptions, and the richly sculptured monument found in Burra Isle. These are all indications of the Christianity of the pre-Norse days. Four runic stones have been discovered, three in Cunningsburgh and one in Northmavine. [Illustration: Bressay Stone (Obverse)] [Illustration: Bressay Stone (Reverse)] [Illustration: Portion of Sandstone Slab with Ogham Inscription from Cunningsburgh] [Illustration: Lunnasting Stone Burra Stone] 16. Architecture Scalloway Castle, and Muness Castle in Unst, are the only two feudal structures in the islands. [Illustration: Scalloway Castle] Scalloway Castle was built by Earl Patrick Stewart in 1600, at a time when Scalloway was the capital and the only town in Shetland. Over the gateway was a Latin inscription, adapted from the New Testament contrast between the house founded on a rock and the house founded on the sand— “Patricius Orchadiae et Zetlandiae Comes. Cujus fundamen saxum est, domus illa manebit; Labilis, e contra, si sit arena, perit. A.D. 1600.” Patrick’s house in Sumburgh had been built on sand and had collapsed, it is said. [Illustration: Muness Castle, Unst] Muness Castle dates from 1598 and belonged to Laurence Bruce of Caltmalindie, Lord Robert Stewart’s half-brother. He was at one time Grand Foud of Shetland, but for his oppressive rule he was brought to trial at Tingwall and deposed from office. As no one could conscientiously praise him, he did so himself in the following inscription over the Castle doorway:— “List ye to knaw this building quha began, Laurance the Brus he was that worthy man, Quha earnestlie his ayris and offspring prayis To help and not to hurt this wark alwayis. The zeir of God 1598.” At Sumburgh is the ruin of Jarlshoff, once a residence of Lord Robert Stewart, and rendered famous in Sir Walter Scott’s novel _The Pirate_. [Illustration: Town Hall, Lerwick (Midnight, June)]