Jeremiah S. Ferguson 1 
3. In all four types circular muscle is either absent or noticably 
deficient. 
4. In the large central veins prominent and characteristic muscular 
ridges are constantly present, and are frequently in relation with those 
points at which the branches of these vessels enter. 
5. These peculiarities of structure may possibly bear a close physio- 
logical relation to the function of the adrenal as a gland that forms an 
internal secretion which has been shown to be a powerful vaso-constrictor 
and stimulant of smooth or involuntary muscle. 
BIBLIOGRAPHY. 
1. AIcHEL.—Miinch. med. Wochenschr., 1900, XLVII, 1228; and Arch. f. mik. 
Anat., 1900, LVI, 1. 
2. WIESEL.—Anat. Hefte, 1901, XVI, 115. 
3}. Ibid., 1902, XIX, 481. 
4. Soutiz.—J. de l’anat. et de la physiol., 1903, XX XIX, 197, 390, 634. 
5. Frint.—Contrib. dedicated to W. H. Welch, Baltimore, 1900, 153; also in 
Johns Hop. Hosp. Rep., 1900, IX, 153. 
6. Minot.—Proc. Bost. Soc. Nat. Hist., 1900, X XIX, 185. 
7. PFAUNDLER.—Sitz. d. Akad. d. Wissensch., Wien, 1892, CI, 515. 
8. GotrscHau.—Arch. f. Anat., 1883, 412. . 
9 
0 
. WEIGERT.—Centralbl. f. allg. Path. u. path. Anat., 1898, IX, 289. 
. FREEBORN.—Proc. N. Y. Path. Soc., 1893, 73. 
