282 ENTOZOA. 



obtains in the case of any other bone in the system. Truths of 

 tliis kind should, in future, suggest a caution to those who may hap- 

 pen to meet with cases which, in the first instance, are deemed 

 rare or altogether unique ; but, at the same time, it should encou- 

 rage others who may meet with cases, which are not at first deemed 

 rare or imique, at once to place them on record for the benefit of 

 the profession generally, and of helminthologists in particular. 

 Altoo-ether, M. Davaine collects seventeen bone cases, the remain- 

 ing eleven being as follows : — One from a phalanx of the index fin- 

 ger, two from the femur, one (rather doubtful) from the temporal 

 bone, two from the frontal, one sphenoidal, and two others from 

 the bones of the pelvis. One of the frontal cases is from an Eng- 

 lish source, being recorded by Keate in the tenth volume of the 

 " Medico- Chirm-gical Transactions."* 



Statistics. — Another important aspect in which this subject may 

 be viewed, has reference to the relative abundance of hydatids, in par- 

 ticular localities, and amongst difi'erent classes of people. The ende- 

 mic character of the echinococcus disease in Iceland is well known. 

 Thus, on the authority of Krabbe, a distinguished disciple of the 

 recently deceased savant Eschricht, Leuckart remarks as follows : — 



" For every 100 inhabitants of Iceland there are 1100 head of 

 horned cattle, and every peasant has on an average six dogs. In 

 Denmark there are 180 cattle to every 100 of the people. There 



* Highly interesting and instructive as these statistical records must necessarily 

 prove, one cannot but express a regret that there should be so many intelligent prac- 

 titioners who refuse to place their cases on record ; for, by this negligence we are de- 

 prived of an immense amount of valuable information. !N"o excuse need be advanced on 

 their behalf, seeing that our public journalists are always ready to insert such cases, 

 ])rovided only the communications he brief. In going over our literature, I have been posi- 

 tively startled at the paucity of recorded cases of entozootic disease as compared with 

 their actual prevalence in practice. For my own part, I would feel grateful to any of my 

 professional brethren who would take the trouble to furnish me with a list of the unpub- 

 lished cases which they have encountered from time to time in the course of their ardu- 

 ous duties. I am sure many gentlemen have notes of such cases, especially, for example, 

 cases of Lumbricus, stored up either in MS. or in the tablets of their memories. I 

 may add, however, that, since the above was written, I have met with several more 

 cases of hydatids both in our periodicals and in various miscellaneous treatises. As 

 these additions do not materially affect the general statistical result, I am content to 

 offer references to them in the Bibliography at the end of this work. — T. S. C. 



