TRICHINA SPIRALIS. 337 



me witli abundant examples both of the sexually-mature and imma- 

 ture worm, derived from various experimental animals. In regard, 

 also, to the numerous excellent memoirs on the larvae which have 

 from time to time appeared, it is impossible for me to do more than 

 state the general results obtained by their respective authors. 

 Besides Owen's original writings, helminthology must acknowledge 

 its indebtedness to "Wood, Farre, Paget, Knox, Harrison, Hodgkin, 

 Gairdner, Sanders, Kirk, Turner, Parkes, Frank, and Bowditch. 

 Especially, also, may I be permitted to particularize the beautifully 

 illustrated memoir of Messrs. Bristowe and Rainey ia the " Patho- 

 logical Society's Transactions" for 1854, the resume given by 

 Aitken, and, more particularly, the recently published brochure 

 by Dr. Althaus.* And, finally, as regards foreign writers, I 

 need only enumerate Henle, Diffenbach, Fricke, Oppenheim, Le- 

 blond, Siebold, Kobelt, JSTordmann, Yalentiae, Bischoff, Diesing, 

 Dujardin, Miinster, Svitzer, Luschka, Kiichenmeister, Herbst, 

 Waldeck, Zenker, Weinland, Yan Beneden, Moquin-Tandon, 

 Kiihne, Boehler, KoenigsdoeflFer, Freytag, Friedreich, Knoch, Vir- 

 chow, Leuckart, Davaine, and Rupprecht Fiedler. t 



The young Trichinae, as ordinarily observed in the human 

 muscle, present the form of spirally-coiled worms in the interior 

 of small, globular, oval, or lemon-shaped cysts, which latter appear 

 , as minute specks scarcely visible to the naked eye. These specks, 

 as we have already stated, sometimes resemble little particles of 

 lime, and, in point of fact, are more or less calcareous externally, 

 according to the degree of degeneration which their walls have un- 

 dergone. In shape and general aspect they are not altogether 

 unlike certain eggs, such as those of Trichocephalus and Trichosoma ; 

 but their size, alone, would be sufficient to distinguish them, since 

 they measure on an average ^" in length, and ^q in breadth. 

 Into the minute structure of their walls it is needless to enter, but 



* On poisoning by diseased pork; being an essay on Trichinosis, or flesh-worm 

 disease; its prevention and cure. By Julius Althaus, M.D., M.E.O.P., Lond., Physician 

 to the Eoyal Infiraaary for Diseases of the Chest. London : 1864. 



t See Virchow's Archiv ; XXVI., s. 573. 



X X 



