250 Dr Wagner on the Structure and 



cyclopedic Methodique, PI. 21, Fig. 9. The animal, including 

 its tail, was j\"' long, and exhibited in its interior a distinct in- 

 testine and ovarium. In the midst of the eggs of the hydatina 

 there were now a number of smaller, rounder, more transparent 

 bodies, but also filled with the granular mass Precisely mea- 

 sured, they were about j^"\ and in some I could perceive the 

 motions of the embryo. I never saw the act of exclusion, but 

 have no hesitation in setting down these bodies as the eggs of 

 the Vort. larva. 



III. Inteslinej and Experiments on Nutrition with Carmine in some 

 other Iijfusoria. 



Feeding by means of a solution of carmine, completely suc- 

 ceeded with me in the larger Infusoria. In the smaller, such 

 as the Monads, Cyclidium glaucoma^ &c. &c. I could not re- 

 peat Ehrenberg's experiments, as I had not the means of em- 

 ploying sufficient magnifying powers, although the animals them- 

 selves, even the little Vibrio aceti were quite distinct under my 

 microscope. In the Faramacium, Trachelius^ Kerona, Euplosa 

 and Vorticella^ however, with a power of 50-60, their filling 

 with red colouring matter was quite apparent. Ehrenberg re- 

 commends for this purpose the pedunculated Vorticellae ; but I 

 could never succeed with them so well as with some of the 

 others, probably because I never found the Vort. convallaria so 

 large as Ehrenberg mentions in his table (/j"'). I seldom found 

 them to exceed -^q'", but here without feeding, I could distinctly 

 see the stomachs like round vesicles, and when filled with car- 

 mine I counted fourteen. In the Euplaa I counted twenty red 

 points filled with carmine. But the experiment succeeded in 

 the most beautiful and perfect manner with a Paramcecium, 

 probably the chrysalis^ which, on one occasion, I found of un- 

 usual size, from \"' to -^-q'". The red-coloured sacks were 

 quite apparent with a power of 24, and very distinct with one 

 of 48. The animalcule itself can easily be seen with the naked 

 eye. When the intestine is once filled, it remains for several 

 days equally distinct. I therefore recommend this infusory ani- 

 mal to any one who is desirous of examining their structure, 

 and of exhibiting it distinctly to others. 



Just as little as Ehrenberg could I ever succeed in inducing 



