PERSULPHURIC 



6074 



PERTH 



Perth, Scotland. General view across the Caledonian Railway 



a duct passes up to the surface. 

 The secreting tube is lined by 

 columnar cells, outside of which 

 is a layer of muscular fibres. 

 Sweat glands are abundant all 

 over the skin, but are most 

 numerous on the parts which are 

 free from hair, particularly the 

 palms and soles. 



There is always a certain amount 

 of activity in the sweat glands, 

 but the secretion, as soon as it 

 reaches the surface, is evaporated, 

 and thus normally the skin feels 

 dry. This is accordingly known as 

 insensible perspiration. Under the 

 influence of exercise, heat, or cer- 

 tain emotions, the activity of the 

 sweat glands is greatly increased, 

 and the secretion then collects on 

 the surface, forming beads or drops 

 of sweat. This is sensible perspira- 

 tion. The physiological function 

 of sweating is to assist in regula- 

 tion of the body temperature. 

 Anidrosis is abnormal diminution 

 in the quantity of sweat excreted. 

 It is seen in diabetes, myxoedema, 

 and some affections of the nervous 

 system. See Hyperidrosis. 

 * Persulphuric Acid. Acid 

 formed when sulphur heptoxide 

 (S 2 O 7 ) is dissolved in water. It is 

 made by the action of sulphuric 

 acid on ammonium or barium 

 persulphate. It is formed during 

 the working of accumulators, 

 owing to the electrolysis of the 

 sulphuric acid used in accumula- 

 tors. On dilution with strong sul- 

 phuric acid mono-persulphuric acid 

 isformed. The salts of persnlphnric 



Sir Pertab Singh, 

 Indian soldier 



Vandt/k 



acid known as persulphates were 

 first prepared by Marshall in 1898, 

 and are now made on a manufactur- 

 ing scale for use as oxidising agents. 

 Pertab Singh, SIR (1845-1922). 

 Indian ruler and soldier. Early in 

 his career he was put at the head of 

 the administra- 

 tion of Jodhpur 

 by his brother 

 the maharaja. 

 In this capacity 

 h e introduced 

 reforms, c o n- 

 structed rail- 

 ways, etc. In 

 1878 he was a 

 member of the 

 mission to 

 Kabul, and 

 took part in the Mohmand ex- 

 pedition, 1897, and the Tirah 

 campaign, 1898. He led Jodhpur 

 imperial troops in China, 1900, 

 and two years later became ruling 

 chief of Idar State in Gujarat, 

 but abdicated in favour of his son. 

 An hon. commandant of the Im- 

 perial Cadet Corps, he served in 

 the Great War, 1914-15, and was 

 promoted lieut. -general. Created 

 K.C.B. in 1901, he was made G.C. B. 

 in 1918. He died, Sept. 3, 1922. 



Perth. Royal and municipal 

 burgh and county town of Perth- 

 shire, Scotland. On the Tay, it is 

 48 m. by rly. N. of Edinburgh, 

 and is served by the Caledonian, 

 N. British, and Highland Rlys. 

 The wooded hills of Kinnoull, 729 

 ft., and Moncrieffe, 725 ft., the 

 magnificent river, and the back- 



bridge over the Tay Friik 



ground of the Grampians combine 

 to form an environment fully justi- 

 fying its being called the Fair City. 

 An ancient city, it was noted for 

 its noble ecclesiastical edifices, but 

 of these there remains only the 

 13th century cruciform church of 

 S. John, from which it derived its 

 former name of St. Johnstown, 

 and in which in 1559 John Knox 

 preached his celebrated sermon 

 against idolatry. Other prominent 

 buildings are S. Ninian's episcopal 

 cathedral (1850-90), the new city 

 hall, the general convict prison 

 for Scotland, and the municipal 

 buildings, the 

 latter on the site 

 of the palace in 

 which the Cowrie 

 conspirators 

 met. The city 

 has a large in- 

 firmary, public 

 library, museum, 

 and barracks. Perth arms 

 There are 



several schools, but the castle 

 and the market cross have been 

 pulled down. 



An imposing nine-arch bridge, 

 840 ft. long, across the Tay com- 

 municates with the suburb of 

 Bridgend, and along the W. bank 

 of the river extend two public 

 parks the N. and S. Inch. Dyeing 

 is the staple industry, and brewing, 

 ironfounding, and the manufacture 

 of ink, linen, gauge glasses, floor- 

 cloth, and chemicals are carried on. 

 From here steamers go to Dundee 

 and other ports on the E. coast. 



Perth, Australia. North Perth seen from King's Park; in the right foreground is Mount's Bay 



