Transmutation of Form in certain Protozoa. 225 



to that indicated in Fig. 23 ; at the same time the film represented 

 appeared as a perfect membrane, quite transparent outside the cilia — 

 a globule of sarcode. 



Sept. 22nd, 1869, I watched Fig. 24 become Fig. 25, with cilia 

 at each end; subsequently it assumed the appearance at Fig. 26, and 

 finally "swam away as a perfect Paramoecium as Fig. 27. 



July drd, 1870, I watched Fig. 28 become Fig. 29, and sub- 

 sequently Fig. 30. In the same liquid I found Figs. 31, 32 and 33, 

 all of which I believe to be modified forms, transitional from some 

 forms of Paramoecium, such as Kolpoda cucullus to Vorticella. Dm'ing 

 the same observation I saw a Vorticella contracting its investing 

 membrane in all directions like an Amoeba, and a change which gave 

 me much pleasure, a decided Paramoecium (Fig. 34) change to an 

 equally decided Vorticella (Fig. 35). I also saw Fig. 36 change the 

 end at which the cilia were working and become Fig. 37, and Fig. 38 

 working cilia at each end successively : also a transparent body 

 resembling a colouiiess Eiiglena change shape as Figs. 39, 40, 41 and 

 42, as if to become a Vorticella. 



July 26th, 1870, I found Figs. 43 and 44 among a number of other 

 forms in the pellicle formed on a liquid containing Vaucheria clavata. 



July 24:th, 1870, I found a Vorticella, apparently intermediate be- 

 tween Paramoecium and Callidina elegam, closely resembling Fig. 47. 

 But on July 26th I watched Fig. 47 change first to Fig. 48, then to 

 Fig. 49, and finally swim out of the field as Fig. 50. Fig. 51 repre- 

 sents a Paramoecium, with a tail like Vorticella — this I saw on 

 April 26th, 1868. On Aug. 13th, 1870, I watched Fig. 45, a decided 

 Paramoecium, change to Fig. 46, an equally decided Kerona. 



Some few years ago, during my early observations, before a date 

 was affixed, I made the drawing. Figs. 60, 61, 62, 63 and 64, from 

 Vorticellce, which I had watched. 



It now simply remains for me to give my reasons for thinking 

 Callidina elegans as merely a developed form of Paramoecium. 



March 26th, I saw Fig. 52, which from former observations I am 

 sure is only the closed form of Figs. 58 and 59. 



Jidy 2^rd, 1870, 1 saw Fig. 53 change to Fig. 54, both of which I 

 belie^'e to be closed form of the same animal. But on March 26th I 

 saw Fig. 55 unfold itself and become Fig. 56. I watched it assuming 

 all the shapes of Callidina elegans, for about five minutes. Fig. 57 is 

 only another shape which the creature assumes, as also Fig. 58. I 

 have made numerous drawings of these creatures, and in some cases 

 I have drawn undoubted Paramoecia ; but the shape and movements 

 are so similar that I have no doubt that subsequent research wOl 

 show these various animalculfe and Infusoria to be simply stages of 

 development of one and the same thing, and that is the monad con- 

 dition which owes its origin to the chlorophyll of vegetables and the 

 germinal matter of animal cells. 



The plate whicli I have attached not only contains no new 

 forms, but the markings are in many cases indefinite ; but feeling 

 convinced, as I do, that many if not most of the body-markings are 



