120 Sir D. Bruce and others. Trypanosome 



from a dimorphic type with 70 per cent, short forms the type gradually 

 changes into a monomorphic type which has lost almost all the short forms 

 and nothing but the long remain. 



This seems to show how fallacious it is to reason from laboratory types of 

 trypanosomes to the wild natural types, and probably accounts for the showers 

 of new species which are constantly falling about our ears. 



Chart 5. — Curves representing the Gradual Change of this Trypanosome from a 

 Dimorphic Type to a Monomorphic. 













P. 



EL "t 



s 





i 



Z 3 





5 



6 



7 



8 



9 



1o 



11 



12 





14 



15 



16 



IT 



18 



IS 



£o 



loo 









































BS 







































■O 



SO 









































S5 









































So 









































75 









































7° 



—i 



J- 





\ 

































« 



<u 65 







1 \ 



V J 

































* 60 

 ■V 55 







4 







































1 



































z 



5o 









































01 



" 45 







t- 



































i- 







1 



































03 



°- 35 







• 



































30 













■4 — 



i 



























25 



\ 





h 





1 



t 





V— 

























2° 











1/ 







I 

























15 





















A 





















10 

















\ 





' ! 





















5 



















\ ' 





\ 



<A 



































tf 











•o. 













^Lond <s ^lender Jbrms 



Breadth. — The following table gives the breadth of Strain I, Dog 48 : — 



