"uumaU'pm^'lbTu.'] Development of Monas Lens. 199 



manure-heaps and dark cesspools, that there are other "choses 

 exterieures" which aifect the cell in its future growth and develop- 

 ment. 



The facts recorded in Parts I. and II., bearing on this subject, 

 will be found as follows : — 



Presence of Monas in air.— M. M. J., Aug., 1869, page 100, lines 10, 

 17, 20, 21 ; Exp., March 5, 1868 ; Exp., May 25, 1869. M. M. J., Jan., 

 1870, page 25, line 21 ; Exp., July 21. 



Monas in Vacuole.— M. M. J., Aug., 1869, page 99, line 27 ; page 

 104, line 4. 



Escape of Monas from Chlorophyll blastoderm. — M. M. J., Jan., 

 1870, page 25, line 17. 



In November, 1867, 1 witnessed under a power of 700, round 

 masses of chlorophyll enclosed within a transparent primordial 

 utricle. I saw the utricle burst, and small transparent bodies, 

 having the appearance of Monas, escape into the surrounding 

 fluid, and at once assume their own rotatory movement. 



Development of Monas to Paramoecium. — M. M. J., Aug., 1869, 

 page 101, lines 1, 2, 8, 9, 11, 12, 13 ; p. 102, lines 40, 42 ; page 103, line 2. 



Monas to Gonidium, Euglena, and Cblorococcus.— M. M. J., Aug., 

 1869 ; Exp., March 5, 1868, e. cj. M. M. J., Jan., 1870 ; Exp., July 

 21, 1869. 



Development of Mucedo.— M. M. J., Aug., 1869 ; Exp., March 5, 

 1868 ; h. Exp., May 25, 1868 ; B, C, D, G, and Exp., Nov. 30, 1869. 



An interesting series of experiments might lead to more certain 

 results did time permit ; but the occupations of an active profes- 

 sional life leave little leisure for more than desultory observations. 

 Thus experiments on results from air (passed through cotton wool) 

 (series of Woulfe's bottles of potassic permanganate, &c.) to organic 

 solutions previously ascertained to be free from living organisms 

 would show how far the previous experiments are free from suspicion 

 or worthy of reliance. 



The opinion that the organisms of this class (the dyalizers, so 

 to speak) have the power to change non-vitalized to vitaHzed matter 

 is supported by Mr. Hassall * and Mr. Browning.t It would seem 

 then that the condition of organized matter known as dead requires 

 an agent to convert it into the opposite condition known as hving. 

 This is shown in the decomposition of organic matter, in which one 

 or other of these protozoal forms seems to play the part of inter- 

 murciator, and in the case of disease where cells are passed from 

 life to death, this all-pervading "minister of health or goblin 

 damned " is ever ready to effect the process. . It may, therefore, 

 not inaptly be termed Nature's scavenger ; and while certain con- 



* Introd., p. 42. t ' Monthly Microscopical Journal," July, 1869. 



