"Each element is represented by a symbol, this symbol being the first letter or letters of the name of the element. The symbol of hydrogen is 'H': of oxygen is 'O'; of gold, 'Au,' the first two letters of the word 'Aurum,' the Latin name for gold. Each symbol also stands for the weight of one of its atoms. (An atom is supposed to be the smallest possible division of a substance.) Hydrogen is the _lightest_ element known, and is taken as the standard of weight when comparing the weight of other atoms. The symbol 'H' would therefore not only stand for the element hydrogen, but for its atomic weight, 1, or a unit. An atom of oxygen is _sixteen_ times as heavy as an atom of hydrogen, and an atom of gold is 196 times as heavy." In the next number of the ROUND TABLE a list of the chemicals mentioned was given, but either through a typographical error or an error in copy, the weight of hydrogen was given as "11," and that of oxygen as "12." It should have been hydrogen "1," and oxygen "16." Those who read the first paper would of course perceive the mistake; but this correction is made for those who may not have seen the first article, or may have forgotten the explanation. CAPTAIN JACK AND THE CANNIBALS. "Well! well! well!" said old Captain Jack, as Bobbie and Tom appeared before him on the beach in front of the Ocean House. "You boys back again, eh? Why, do you know, I never expected to see ye again? For a fact I didn't." "Why not?" asked Bobbie. "Why not?" echoed the old seafarer, as he leaned back against the old wreck and laughed. "Why not? Why, I takes the town paper, I does, an' las' winter I seed a squib in the town paper as said that two hungry cannabiles had descended on New York city, an' et up the whole poppylation. Mebbe you didn't belong to the poppylation. Some folks don't join everything there is a-goin'. Wasn't ye et up?" "How you do talk!" said Bobbie. "If we had been eaten up how should we be here?" "Simple enough! simple enough!" returned the old Captain, pulling away on his pipe. "I was et up once, therefore why not ye, says I," he added. "Eaten up? You?" cried Tom. "How could that be? You are here, aren't you?" "Yes, I be," returned the Captain. "But so also are you in spite of the fact that ar town paper says that two cannabiles has et up the poppylation of New York. If it's a-comin' to manufacture apologizing, it's your turn first." "Well," said Tom, "we don't want to make you mad, Captain Jack. If two cannibals ate up the population of New York, we escaped. Maybe we were in the back of the pantry, where they couldn't find us," he added, with a sly wink at Bobbie. "That's where I was," said Bobbie, resolved to be on good terms with the Captain anyhow. "I heard our next-door neighbors hollering away like everything, so I and my whole family hid away behind the ice-box."