Table I. — The experimental parasitization of 



Method of infection. 



10 : Sept. II and 13, Oct. 7 and 8. 1912 J Fed 



11 , Oct. 14. 1912 . 



i 1 Dec. 21. 23. 24. 27. 28. and 30, 1912.' 



30 , do - ___ 



ai I Feb. 21, 1913 _ 



32 Feb. 21 and 22. 1913 . 



33 I Mar. 7, 1913.. _. 



34 j May 26, 1913 



36 JuneG, 1913 



37 do 



38 June 6, 11. 12. 13, and 14. 1913.. 



40 ] June 20, 21. 23. and 25, 1913. 



43 I do- 



I 



44 June 24, 1913.. 



] Rectal injection 



I Fed - 



Rectal injection . 



^oith Balantidium coli sios and Balantidium coli 



..do 



do 



Rectal injection ...; do - 



j Piff I Encysted _ 



do J do 



! Encysted . 

 ' Motile 



' do 



I Encysted _ 



Stool examination. 

 Result. \ Date. 



Balantidia ...' Oct. 11,1912 



1 

 Nov. 4.1912 



.-do,- 



.-do_ 



■ J: do _ L. 



..! Motile and encysted |.. 



] Negativ 

 • do. 



-do - I do 1 Balantidia . 



! do 



I Neg'ative.,, 

 I Balantidia . 



Negative . 

 Balantidia 

 -,-do..-. 



I Motile I Negative- 



Jan. 6, 1913 



Jan. 4, 1913 



Dec. 27,1912 



Jan. 10.1913 



Jan. 21,1913 



Mar. 8,1913 



June 1,1913 

 June 18, 1913 



July 2.1913 

 June 26,1913 



June 22, 1913 

 June 28. 1913 



Fate of monkey. 



Diarrhoaa with flakes of bloody 



sick. Feb. 9, 1913. 

 Negative _ _ j kj] 



i; very | Killed, Feb. 10, 1913 . 

 I. Nov. 21. 1912 - 



.-.do, 

 --.do . 



Bloody 

 Negative 



13 stools on day of death 



Diarrhoea, very sick, July 25. 1913.- 



Died. Apr. 14. 1913.. 

 Died, Feb. 3. 1913... 



Killed, Mar. 19. 1913 

 Died, Feb. 17, 1913.- 

 Killed. Mar. 4. 1913. 

 Died. Apr. 4, 1913... 



Died, Apr. 16, 1913.. 

 Died, Mar. 31, 1913.. 

 Died. June?, 1918 .. 



Died. June 8. 1913 .. 



Killed, July 26. 1913 



do 



do 



do.- 



Killed, July 28, 1913 



Killed, July 25, 1913 

 Killed, July 28, 1913 



observa- ■ 



Colitis and ulceration of large intestim 



balantidia. 

 Slight colitis; balantidia 



Colitis; no balantidia 



Colitis; balantidia 



do 



--- do --- 



Large intestine normal; many balantidia 



Negative _ 



do 



Colitis; no balantidia 



Colitis; balantidia -- 



Negative 



do 



do 



Slight colitis: no balantidia 



Slight colitis; balantidia 



Negative 



Slight colitis; no balantidia.. 

 do 



I Superficial ulceration; hypi 



polymorphonuclear 



Hyperaemia; punctif orm hiemorrhagea: eoainophile infil- 

 tration of mucosa; balantidia in mucosa and blood ves- 

 sels of submucosa. 



Catarrhal exudate; no balantidia 



Catarrhal exudate; minute superficial ulcers; polymor- 

 phonuclear infiltration; no balantidia. 



Catarrhal exudate; no balantidia 



None made __ 



do "-!!!!!""!!!"]!]!!!!!!]' 



Balantidia in mesenteric lymph glands; no cellular rc- 

 Nonemade 



do ""!!!]"]!!! 



Diphtheritic exudate; slight polymorphonuclear infiltra- 

 tion; no balantidia. | 



Hsemorrhagic exudate; some destruction of epithelium; I 

 no balantidia. j 



None made - - _ 



do -. _ I 



Negative _ j 



Slight hsemmoiThagic exudate; eosinophile infiltration; i 

 no balantidia. i 



Slight diphtheritic exudate; punctiform hjemorrhages; I 

 eosinophile infiltration of mucosa. I 



None made - _ i 



do.- 



Congestion of n 



sinophile infiltration; no balan- 



