THE CASTOR BEAN 125 



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apple, or oak which show about three years' growth are satisfactory. The 

 wood is hard to cut and is apt to injure the razor. It may be softened by 

 soaking the stem in a mixture of equal parts of alcohol and glycerine. The 

 stems should remain in this mixture for several days at least, and may be 

 left in it for months without injury, and be ready for section at any time. 

 For the study of a flower any simple wild-flower may be used to show the 

 general relations of the reproductive organs. A common Trillium is an 

 excellent example. The grosser anatomy of the flower should be studied; 

 sections should be made through the ovary both of a young flower and, if 

 possible, of the fruit after the flowering is completed, in order to show the 

 chambers of the ovary and the seeds with their attachments. The pollen 

 should be examined with a microscope. 



BOOKS OF REFERENCE 



ANDREWS, Practical Course in Botany, American Book Company, 

 New York. 



ATKINSON, College Botany, Henry Holt & Co., New York. 



BERGEN and CALDWELL, Practical Botany, Ginn & Co., Boston. 



CALDWELL, Plant Morphology, Henry Holt & Co., New York. 



COULTER, BARNES, and COWLES, Text-book of Botany, American Book 

 Company, New York. 



CURTIS, Development and Nature of Plants, Henry Holt & Co., New York. 



DUGGAR, Plant Physiology, The Macmillan Co., New York. 



GANONG, Plant Physiology, Henry Holt & Co., New York. 



MACDOUGALL, Plant Physiology, Henry Holt & Co., New York. 



STEVENS, Anatomy of Plants, P. Blakiston's Son & Co., Philadelphia. 



STRASBURGER, NOLL, SCHENCK, and KARSTEN, Text-book of Botany, 

 The Macmillan Co., New York. 



