The Monad's Place in Nature. 219 



masses having a green colour, to minute specks which were only 

 visible by scintillating in reflectol light (see Fig. i. h) ; and in all 

 examinations of matter containing organisms, certain particles are 

 seen to revolve upon their own axes, and to present what appear 

 to be signs of life. These solutions, if watched from day to day, 

 present objects having the same movements, which gradually deve- 

 lop until they present the same appearance as the Monads before 

 referred to, as being caught from the air and beiag discharged from 

 the Pseudo-gonidia and the tubules of Vaucheria. 



An examination of the experiments recorded in my earlier papers 

 in this Journal shows these same Monad forms as always the first 

 to make their appearance. 



In the experiment, March 5, 1868,* bottle h, with only a limited 

 quantity of air, develops first Monads and Mucedo on cork ; and 

 after more air had been admitted, successive observations showed 

 Monads, Vibrions, and ultimately Paramoecium. 



In Experiment e, the ultimate development from the same source, 

 but under different circumstances of light and aii", was green Gonidia, 

 Euglena, and green filaments. 



But in (/ the result was an immense number of full-sized 

 Euglenae. 



The sources of all these developments seem to me (who watched 

 the liquids daily for two mouths) to be the same minute pin-point 

 Monad which Dr. Bastian refers to in his papers in ' Nature.' An 

 examination of my note-book during the watching of these liquids 

 shows numerous forms which the Monads presented (Fig. sii. 6), 

 evidently transitional from the round pin-head Monad to oval young 

 Paramoecia, until we come to sufficient size to give it a name such 

 as Koli^oda cucidlus, &c. (Fig. xii. 7). 



In the vacuole of Vaucheria I observed that organisms in se- 

 veral stages of development existed in active motion at the same 

 time (Fig. i.c, d,e,f), and Ijhave since been able to verify this opinion 

 by observing full-grown Euglense in the tubule actively moving ; 

 but on April 11th, 1869, I saw the birth of Euglense from a tubule 

 of Conferva rivularis, and on escaping they took on all their poly- 

 morphic changes, and although small in size were full of life (see 

 Fig. II.). 



The important deduction from this fact is that there are various 

 stages at which the organism enters upon its independent existence, 

 and it may fairly be presumed that as the stage is early or deve- 

 loped, so will the amount of heredity vary, and the tendency to 

 resist the chases exterieures, or accidents of life, become greater. 



The "pin-point" Monad being in an earlier stage, and pos- 

 sessing less heredity, may, and most likely does vary more under 

 the influence of these accidents of life, such as light, an*, il'c. 



* 'M. M. .T.,' Aug., 1869. 



