General Science. 187 



1 inch square, with 6 connecting lengths at each joint 1 foot 6 inches, by 

 10 inches, and 1 inch square, secured by two bolts at each joint, each bolt 

 weighing about fifty- six pounds. The total number of bars, in the cross 

 section of the chains, is eighty. 



A second chain was drawn over on Thursday morning, the 28th ult. ; 

 and there are fourteen other chains in readiness to be drawn over, when 

 the tide will serve, which will complete the line of suspension. 



36. Number of Steam-Engines in Glasgow and its neighbourhood in 



Total 310 6436 



Average power of engines 20j fi ^* 5 horses. 

 Cleland's Hist. Account of the Steam-Engine. 



37. Number of Steam Boats on the Clyde in 1825. — On the llth of April 

 1825, there were on the Clyde 53 steam-boats, having 68 engines, and a 

 power of 1926 horses. Four of these steam-boats are each driven by two 

 engines of 50 horse power each, viz. the Majestic, the City of Glasgow, the 

 Superb, and the Ailsa Craig. — Id. 



38. Poisonous Effect of While Bread upon Dogs. — Dr Magendie is said 

 to have found, that when he fed dogs with white bread and water they all 

 died within 50 days. When the bran was left in the bread no bad effects 

 ensued. 



39. The Goitre cured by Subcarbonate of Soda. — M. Peschier of Geneva 

 has performed many surprising cures in cases of goitre, by administering 

 a solution of subcarbonate of soda, more or less disguised by other sub- 

 stances. In the case of a girl fourteen years old, he gave 2 gros, or 118 

 grains every day, From two grains to half an ounce of the alkali is dis- 

 solved in eight ounces of water, and a table-spoonful of the solution taken 

 twice a-day, in half a glass of wine, or sugar and water. — Bibl. Univ. 

 vol. xxiii. p. 146. 



40. Artificial Production of Pearls — The invention of forcing the pro- 

 duction of pearls by fresh water bivalves, is said to belong to the Chi- 

 nese. For that purpose rounded pieces of mother-of-pearl are intro- 

 duced into the shells. Mr Gray introduced thirty or forty pieces into the 

 6hells of the Anodonta cygneus, and Unio pictorum. Only two were push- 

 ed out again, the rest being placed by the animal in a convenient situa- 

 tion. — Ann. of Phil ix. p. 27. 



• In 1824, there were upwards of 200 steam-engines in Manchester. 



