708 JJH. II. 1!. I'ANTIIAM OX AVIAN fOCCI DIoSlS. {^^•^}' 



rj.Aii-; LXI. 



Fij;-s. i-S -50. Trichomonas eherthi AwA Monocorconionas. X I'KW. 



4.3-i6. Trichnmnnas forms from cwcum of grouse. 



47-iS. J/o«f)(r;'c"mo»/r« forms. Fijr. 47 iiitermediixtc foi'm. 



40. Dividing' Trichomonas. 



hO. Encysting: Trichomonas. 



nl-57. Hpirochoita locati i'rom the citca of irroiisc. X 1700. 



08-60. Amaha {Kntam(cha) Jar/o/iodis from iiitestiiu- and faeces ot grouse. 

 58, .in, t!l, (i-J. (i.3. Ain(i>l.a>. X SOO. 



60. Aino'Ua wliicli lias assuinod a i>yrit'oriu sliapf. X 750. 



64-6,'). Eiicvstcd aniu'liiu. X H>:i(t. 



3. E\])('riiiiciif;il studies 011 Avian ( 'occidiosis. cspeciallv in 

 I'clation to vounti" (iroiiso, Fowls, and I'iii'cons. By 

 JL. B. Fantham, D.Se. Lond., ]].A. ('antah.. A.U.C.H., 

 F.Z.S.. Christ^s College, Canihridge, As.sistant 1o the 

 Quick Professor of Biology in the Univer.sity of dani- 

 hfidge ; Pi'otozoologist to the (ironse Disea.^^^e Inquiry. 



(l>latc LXI].* and text tigure (Hi.) 



liffeivcd April 5, lillO.j 

 C'U.NTICNTS. 



Page 



I. Introduction 7o8 



II. Kxpprimeutal Methods 709 



III. Syniptonis of Coccidiosis 710 



IV. The condition of the Internal Organs of Infected Birds 713 



V. Hehitivercsistanceof different hreeds of Fowls and Pigeons to Coccidiosis ... 716 



V I. The Dissemination of Coccidiosis over Tracts of Country 717 



VII. Duration of Vitality of Coccitlian Oocysts 718 



VIII. Ert'ects of certain reagents on Coccidian Oocysts 719 



IX. (Concluding Remarks 721 



Keferences to Li t erat ure 721 



Exphmati.in of Plate 722 



I. I.\ ri!o]>r( TJox. 



Protozoal parasites are lii^ldy speeiali.sed animalcules Avjiich 

 live in intimate relation with tlie hosts they infect. While many 

 of the Protozoa are ea|>a))Ie of living in one host only, there arc 

 others which are under suspicion of infecting several .species of 

 higher organisms as host, and of not heing .so limited to one host 

 as was formerly believed. One test for the specificne.ss of any 

 protozoal parasite is that it fails to develop in any animal other 

 than its special, natui-al host, and merely peri.shes when inoculated 

 or otherwise introduced into any other animal. In order to test 

 the specificness of the coccidian parasite of the grouse, experiments 

 wei'c made, with the result that the Coccidh(m pathogenic toyovmg 



*• Fur c\[)l:inat lull ol the Pial'' -cr y. 7--- 



