62 



Description of the Illustrations. 



IMPART \. 



PIGTJRES. 



Stellate appearance of the red cells Ixi. 



White corpuscles „ 



White corpuscles spread out like an amoeba „ 



Subsequent aspect of the red cells. The condition usually observed when found in alvine 



discharges .............. . „ 



The alterations observed to take place in a sin^jjlc white corpuscle „ 



White corpuscle surrounded by a halo-like pellicle „ 



Corpuscles and animalculie observed in the stool of a perfectly hcaltky person . . . Ixii. 



As seen immediately after being voided ........... „ 



As they appeared 24 hours later . . ........... Ixiii. 



iros. 

 1 

 2 

 3 



4 

 5 

 6 



Plate XVII. 



Development of the lowest forms of life in organic solutions. 



Monads Ixiv. 



Bacteria . „ 



Vibriones . . . . . • . . . . „ 



Leptothrix „ 



Appearances presented in a filtered solution of organic matter (^unboiled) on the second day . Ixv. 



Ditto third day, showing the appearance of the "heaps". Ixvi. 



Appearances presented in a filtered solution of organic matter Qimboiled') on the fifth day, 



vibriones increased in length .... Ixvii. 



Ditto, ditto, circular bodies developed in the midst of the heaps Ixviii. 



Developed on the third day in a solution of organic matter (l)oiled') ..... Ixix, 



Plate XVIII. 

 Development in organic solutions of tJw lower forms of life. 



Objects presented in a boiled and filtered solution of organic matter towards the end of the 



third week ................ Ixx, 



The animalculse present in the above solution, which towards the end of the fifth week 

 could not be distinguished from those described as being present in the alvine discharges, 

 both in the active and " still " condition. The nature of the green cells in the midst of 

 the molecules is not known Ixxi. 



Spores developed in another test tube containing a portion of the organic solution used at 



Ixix-lxxi. K.B. — This tube had been breathed into Ixxii. 



Ditto in process of germination ..... Ixxiii. 



The appearance of the spores (Ixxii) as modified by the addition of gum water . . . Ixxiv. 



Dr. Maddox's slide for cultivation experiments. Two strips of tinfoil are seen to intervene 

 between the glass-slide and the thin covering-glass, with the preparation in the centre. 

 ,' The arrows indicate the spaces left open for the admission of air bcxv. 



Plate XIX. 



Development in solutions of organic matter of loio forms of life. 



Amoeboid bodies which appeared in a boiled and filtered solution of organic matter on the 



fourth day Ixxvi. 



The various forms assumed by one amoeba „ 1 



A portion of the substance of the amoeba becomes detached „ 2 



The detached portion exhibits movements „ 3 



Process of division into two portions of nearly equal size „ 4 



Segmentation complete „ 5 



Appearance of a contractile vacuole in the detached segment „ 6 



Ditto fifth day • Ixxvii. 



Amoebae ,> 1 



Ditto becoming stellate on the addition of water . „ 2 



The form subsequently assumed by No. 2 .......... . „ 3 



