22 THE WORLD'S WORKERS. 



Mary never entertained the idea of going into a book- 

 seller's and ordering it. Yet the title of the work was 

 remembered, and when, later, it was discovered that 

 Mary's brother was in need of a tutor, and a gentle- 

 man named Mr. Craw was chosen to fill the situation, 

 Mary ventured to consult him about her studies, and 

 asked if the first time he went to Edinburgh he would 

 buy for her the books she needed. He did so, and 

 thus she became possessed of what she had so long 

 desired. She set to work with a will, and, except 

 for a little occasional help good-naturedly given 

 by Mr. Craw, studied alone with determination and 

 assiduity, worked out algebraical problems, gradually 

 forming an acquaintance with those great natural 

 laws which are the key to so much that is mysterious 

 in the story of the heavenly bodies. 



Mary was so busy before she began Euclid that it 

 is not astonishing that she found a little difficulty in 

 making the new study " fit in " with all her other 

 work. Already she rose early that she might find 

 time for practising music ; now she found it necessary 

 to sit up late for algebra. This habit was eventually 

 put a stop to, not because it was too much for the 

 girl, but because it caused the consumption of too 

 many candles. " The servants complained that it was 

 no wonder the stock of candles was soon exhausted, 

 for Miss Mary sat up reading till a late hour." So 

 orders were given that Miss Mary's candle should be 

 taken away as soon as she was in bed. 



