. Bacteria, especially as they are related to the economy of nature. Bacteriology. THE BIOLOGY OF BACTERIA 15 partly understood. Heating the slide or medium accelerates all movement. A fresh supply of oxygen, or indeed the addition of some nutrient substance, like broth, will have the same effect. There are also the somewhat mysterious powers by which cells possess inherent attraction or repulsion for other cells, known as positive and negative cheiniotaxis. These powers have been observed in bacteria by Pfeiffer and Ali-Cohen. The essential condition in the motile bacilli is the presence of f
. Bacteria, especially as they are related to the economy of nature. Bacteriology. THE BIOLOGY OF BACTERIA 15 partly understood. Heating the slide or medium accelerates all movement. A fresh supply of oxygen, or indeed the addition of some nutrient substance, like broth, will have the same effect. There are also the somewhat mysterious powers by which cells possess inherent attraction or repulsion for other cells, known as positive and negative cheiniotaxis. These powers have been observed in bacteria by Pfeiffer and Ali-Cohen. The essential condition in the motile bacilli is the presence of flagella.^ These cilia, or hairy processes, project from. Bacilli, Showing Flagella the sides or from the ends of the rod, and are freely motile and elastic. Sometimes only one or two terminal flagella are present ; in other cases, like the bacillus of typhoid fever, five to twenty may occur all round the body of the bacillus, varying in length and size, sometimes being of greater length even than the bacillus itself. It is not yet established as to whether these vibratile cilia are prolonga- tions of capsule only, or whether they contain something of ' A Jlagelluni is a hair-like process arising from the poles or sides of the bacillus. It must not be confused \vith a filament, which is a thread-like growth of the bacillus Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Newman, George, Sir, 1870- [from old catalog]. New York, G. P. Putnam's sons;
Size: 1583px × 1578px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyorkgpputnamsso
