Miscellanies. A405 
and those in ihe fourteenth, were principally produced by the second 
kind of induction. Although I may be too sanguine in reference to 
the results of this discovery, yet 1 cannot refrain from adding that it 
appears to lead to a separation of the electrical induction of a galvan- 
ic current from the magnetical, and that it is a step of some importance 
towas a more precise knowledge of the phenomena of magneto- 
electricity.” 
19. Ehrenberg on the Infusoria.—The following interesting conclu- 
sions are stated in a short review, given in Charlesworth’s Mag. of Nat. 
Hist. London, Oct. 1839, of Ehrenberg’s recent work, entitled Die 
Infusions thierchen, etc. (Leipzig. folio. 64 plates.) In the Infu- 
soria themselves, Prof. Ehrenberg has either confirmed or first estab- 
lished a considerable number of very curious qualities and relations, 
which are highly interesting in a physiological and other points of 
view, the most important of which we briefly enumerate. 
1. Most (probably all) microscopic animaicula are highly organized 
animals. 2. They form, according to their structure, two well-defined 
classes. 3. Their geographical distribution in four of the parts of the 
world follows the same laws as that of other animals. 4. They cause 
extensive volumes of water to be colored in different ways, and occa- 
sion a peculiar phosphorescence of the sea by the light they develop. 
5. They form a peculiar sort of living earth; and as 41,000 millions 
of them are often within the volume of one cubic inch, the absolute 
number of these animaicula is certainly greater than that of all other 
living creatures taken together; the aggregate volume is even likely 
to be in favor of the animalcula. 6. They possess the greatest a 
of generation known within the range of organic nature; one i 
vidual being able to procreate many millions within a few sicker 
time. 7 The animalcula form indestructible earths, stones, and 
rocks by means of their siliceous teste ; with an admixture of lime or 
soda they may serve to prepare glass; they may be used for making 
floating bricks, which were previously known to the ancients; they 
serve as flints, as tripoli, as ochre, for manuring land, and for eating, 
in the shape of mountain meal, which fills the stomach with a harm- 
less stay. They are sometimes injurious by killing fish in ponds, in 
making clear water turbid, and in creating miasma; but that they 
give rise to the plague, cholera morbus, and other pestilential diseases, 
has never been shown inacredible manner. 8. As far as observation 
goes, the animalcula never sleep. 9. They exist as Entozoa in men 
and animals, the Spermatozoa not being taken into consideration here. 
10. They themselves are infested with lice as well as Entozoa, and on 
the former, again, other parasites have been observed. 11. They are, 
