1879.] 



On the Abdominal Circulation in Man. 



489 



euli, Spirochoeta plicatilis) may often add considerably to its bnlk, and 

 may, perhaps, modify its characters under certain conditions. 



The slime which exists around and between the teeth is composed 

 of the same constituents as the fur on the tongue ; all the organisms 

 which are found in the one are found also in the other. Bacillus subtilis 

 exists, however, in greater quantity in this tooth-slime than in the 

 fur, and the rods and filaments are usually much longer in the tooth- 

 slime, probably because they are not subjected to so much dis- 

 turbance. 



In conclusion I have to thank Dr. Burdon Sanderson and Dr. 

 Lauder Brunton, for valuable suggestions, and for the kindly interest 

 they have shown in this work. 



A List of the principal Works relating to the Nature and Character of 



Tongue Fur. 



1831. Piorry. " Du Procede Operatoire." Paris, 1831. 



1845. Remak. " Diagnostische und Pathologische Untersuchungen." Berlin, 

 1845, s. 221. 



1849. Pfeufer. " Der Munclhohlenkatarrh." Henle u. Pfeufer. Ztchft. f. Eat. 



Med., Bd. 7, 1849, s. 180. 



1850. Miquel. " Untersuchungen iiber cler Zungenbeleg." Prager Yiertel 



Jahrschft,, 1850, Bd. 28, s. 44. 

 1853. Robin. " Yegetaux Parasites." Paris, 1853, p. 345. 



1861. Xeidhardt. " Mittbeilungen iiber die Veranderungen der Zunge in Krank- 

 heiten." Arch. d. Wissensch. Heilkunde, Bd. t, 1861, s. 294. 

 „ Hyde Salter. Todd's " Cyclopaedia of Anatomy and Physiology." Art. 

 " Tongue." Yol. iv, pt. 2, p. 1161. 



1866. Hallier. " Die Pflanzlichen Parasiten." Leipsig, 1866. 



1867. Kolliker. " Handbuch der Gewebelehre." 5th Auflage. 1867. Ss. 348 — 



349. 



1873. Fairlie Clarke. " Diseases of the Tongue." London, 1873, p. 93. 



1874. Billroth. " Coccobacteria septica." Berlin, 1874, s. 94. 

 „ Bobin. " Lecons sur les Humeurs." Paris, 1874, p. 550. 



1877. Koch. "Untersuchungen iiber Bacterien." Cohn's Beitrage zur Biologie 

 der Pflanzen, Bd. II, Hft. 3, s. 399. 



II. u Note on the Supplementary Forces concerned in the Ab- 

 dominal Circulation in Man." By J. Braxtox Hicks, M.D., 

 F.R.S. Received March 26, 1879. 



During the ordinary inspiratory effort, the descent of the diaphragm, 

 most noticeable in the male, necessarily produces pressure on the abdo- 

 minal viscera in contact with its lower surface ; these in their turn 

 press down the intestines, which, acting as fluid enclosed in closed 

 elastic sacs, press equally in all directions. Thus during each descent 

 the abdominal walls are projected forwards, as may be readily seen by 

 adapting an instrument similar to a cardiograph resting on three feet, 



