Cellular Plants. 251 



in tin early stage of development. The family of the Vorticella 

 exhibits so close a relation with Biyozoa, and especially with the genus 



a/ 



FIG. ill. 



Transformation of Chlorophyl Corpuscles ( x 600 ) ( Itaxtian ).' 



a.- Pale nnaltared Chlorophyl Corpuscles of Nitella (coufervoid alga). 



b Others alongside of first, larger, of darker green and slightly granular. 



c. Others more discolored, a few green granules still remaining. 



d. Similar Corpuscles with motionless rays and vacuole. 



c.- Similar ones formed into sluggish Artinophrys. 



/.First stage in forming some of the Actinophrys into Amoebae, g, and others into 

 Monads, h. 



j. Organisms like Enchelys, probably developed from the Monads or Amoebae. 



These transmutations took place in an internode of Nitella, 2% inches long, after being 

 corked up 6 weeks with water in a test tube. 



Pedicellina, that I have no doubt that wherever Bryozoa should be 

 placed, Vorticella should follow and be ranked in the same division with 

 them. The last group of Infusoria, Bursaria, Paramecium and the like, are 

 as I have satisfied myself by direct investigation, germs of fresh water 

 worms, some of which I have seen hatched from eggs of Planaria laid 

 under my eyes. " No better proof need be required of the origin of the 

 Molluscoid Bryozoan with its tentacular arms, from the Infusorium with 

 its vibratile cilia. We have here an organism arising in two apparently 

 different ways ; one by evolution of the organism from an inferior form, 

 and the other by birth or reproduction from a superior form. For ex- 

 ample, an Infusorium arises by development from an infusion, and 

 another just like it comes from the egg of a Worm. This history re- 

 peats itself in the development of the higher animals including Man as 

 we have seen ; the larval or embryo form of every one being at dif- 

 ferent stages like the mature forms of inferior animals. In the case of 

 the infusorium and worm, the imitation is more exact than in that of 

 higher organisms, that is all. Bastian is of the opinion that the gre- 

 gnriini> which are formed in the bodies of lower animals, may be derived 

 from the white blood corpuscles. While the white corpuscles are them- 

 selves developed from globules of lymph or chyle. Bacteria are formed 

 in many blind cavities of the animal body, the liver, brain, etc. M. 

 Trecul discovered within the cells and lactiferous vessels of certain 



"Annals ol 'Nat. Hist., ltffo, vol. vi, p. 150, 



