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Even with his college training he found it difficult to form clear mental conceptions of the results of investigations reported in the bulletins. Sometimes the data were reported in percentages and sometimes in parts per million. No reports gave the amounts of the element phosphorus; but PO4 was given in some places and P2O5 in others.
Bob cast a guilty look at his brother, who stuck his hands in his pockets and looked at the conflagration with smiling patronage. "Phosphorus pentoxide P2O5," he remarked coolly. "What a lark!" "It wouldn't have been a lark if the Mouse had been stifled by the nasty, horrid fumes," said Lettice angrily. "Get some water at once and help us put it out, before the whole house is on fire."
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