CHAP. XXXVI.] VERTEBRATA. 537 



ure throe, and glands; and there are certain accessory glandular structures ? 

 vesiculoe seminales, prostate, and Cowper's glands, opening into the urethra 

 in its course. Into the different numbers, modification, and structure of 

 these organs it is not worth while to enter. In the rabbit, the ovary exhibits 

 some trace of the racemose structure, and, by the different modifications of 

 the uterus, dependent on the proportionate size of its body and cornua, we 

 are conducted from the marsupialia, in which the two uteri are entirely dis- 

 tinct, to the human female, in which the single uterus exists in its greatest 

 degree of concentration. 



In writing the present chapter, the authors have received much assistance, 

 from the following works : Mailer's " Elements of Physiology," by Baly ; 

 Professor Owen's Lectures " On Comparative Anatomy," and his treatise " On 

 Parthenogenesis " ; Dr. Carpenter's " Principles of General and Comparative 

 Physiology"; Victor Cams' "System der Thierischen Morphologic "; Art. 

 Ovum, in the "Cyclopaedia of Anatomy and Physiology," by Dr. Allen 

 Thompson ; " On the Alternation of Generations," by Professor Steenstrup, 

 translated by the Ray Society. 



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