10 Additional Notes. 



II. Those that have External Organs. 



* Naked, or not enclosed in a shell. 



1. Cercaria: Caudatum. With a tail. 



2. Trichoda: Crinitum. Hairy. 



3. Kerona: Corniculatum. With horns. 



4. Himantopus: Cirratum. Cirrated. 



5. Leucophra: Ciliatum undique. Every part ciliated. 



6. Vorticella: Ciliatum apice. The apex ciliated. 



* Covered with a shell. 



7. Brachionus: Ciliatum apice. The apex ciliated. 



1. These animalcules are discovered in two or three days in all 

 decompositions of organic matter, whether vegetable or animal, in 

 moderate degrees of warmth with sufficient moisture. 



2. They appear to enlarge in a few days, and some to change their 

 form; which are probably converted from more simple into more com- 

 plicate animalcules by repeated reproductions. See Note VIII. 



3. In their early state they seem to multiply by viviparous solitary 

 reproduction, either by external division, as the smaller ones, or by 

 an internal progeny, as the eels in paste or vinegar; and lastly, in 

 their more mature state, the larger ones are said to appear to have 

 sexual connexion. Engl. Encyclop. 



4. Those animalcules discovered in pustules of the itch, in the 

 feces of dysenteric patients, and in semine masculino, I suppose to be 

 produced by the stagnation and incipient decomposition of those 

 materials in their receptacles, and not to exist in the living blood or 

 recent secretions; as none, I believe, have been discovered in blood 

 when first drawn from the arm, or in fluids newly secreted from the 

 glands, which have not previously stagnated in their reservoirs. 



5. They are observed to move in all directions with ease and 

 rapidity, and to avoid obstacles, and not to interfere with each other 

 in their motions. When the water is in part evaporated, they are seen 

 to flock towards the remaining part, and show great agitation. They 

 sustain a great degree of cold, as some insects, and perish in much the 



