128 ANATOMY 



islets were brought into view by the method of injection and 

 his record according to body weight after birth is based on 44 

 albino rats. The gross results are given in table 88 a. The 

 weight of the pancreas increases with body weight and also 

 tends to be heavier in the female. The absolute number of 

 islets is highly variable yet, in a general way, the number in- 

 creases rapidly for the first twenty days — the period of de- 

 pendence on the mother ^ — then reaches and maintains rather a 

 high value for the next thirty days, but later decreases some- 

 what with advancing body weight and age. There are four 

 instances (three males and one female) of very high numbers of 

 islets, all in animals under 80 days in age and 170 grams in 

 body weight. These instances appear to be individual varia- 

 tions. As the absolute number of islets increases less rapidly 

 than does the weight of the pancreas or that of the entire body, 

 it follows that the islets become relatively less numerous when 

 so compared. The absolute weights of the pancreas are in this 

 series less than those found by Hatai (M8) in table 147, but 

 this difference appears to be due largely to differences in the 

 method of preparation for weighing. 



anatomy: references 



Anatomy — gross and microscopic. Akamatsu, '05. Anglas, '10?. Brisson, 

 1756. Flower, 1872. Goto, '06. Krause, 1876. Leydig, 1854, 1857. Martin 

 and Moale, 1884. Meyer, 1800. Morrell, 1872. Owen, 1868. Rolleston, 1870. 

 Waller, 1693. Wiedersheim, 1897. 



Histology. Allen, '16, '19. Bell, '11. Bensley, '08. Bullard, '12. Drew, 

 '23. Duesberg, '07. Gage, 1887. Gottlieb, '14. Gulliver, 1839, 1842. Hance, 

 '17. Hartley, '07. Hatai, '02 b. Hoyer, 1890. McMunn, 1884. Macklin and 

 Macklin, '20. Mayer and Schaeffer, '14. Miller, '22. Schafer, '00. Solger, 

 1889. Zoja, 1891. 



Embryology, (a) Spermatogenesis. Allen, '18. Benda, 1887. Brown, 1885. 

 Duesberg, '08, '08 a, '09. Ebner, 1888, 1899. Hague, '14. Hewer, '14. Jensen, 

 1887. Leeuwenhoeck, 1693. Lenhossek, 1898. Meves, 1898. Montane, 1889. 

 Regaud, 1899, '00 b, '00 c, '00 d, '00 e, '00 f, '01, '01 a, '01 b, '01 c, '03, '04. Ren- 

 son, 1882. Retzius, '09. VanHoof, '11, '12. Wiedersperg, 1885. (&) Oogenesis 

 and fertilization. Aral, '20. Bellonci, 1885. Blanc, 1892. Coe, '08. Huber, 

 '15 b. Kirkham, '10. Kirkham and Burr, '13. Long, '12. Long and Evans, 

 '22. Mark and Long, '12. Novak and Eisinger, '23. Pratt and Long, '17. 

 Sobotta and Burckhard, '10. Tafani, 1889, 1889 a. Widakowich, '10. (c) 

 Earlier stages. Balfour, 1881. Begg, '16. Cristiani, 1892. Firket, '20. Eraser, 



