Bacteria Especially as they are related to the economy of nature, to industrial processes, and to the public health

Injurious micro-organisms in foods are, fortunately for the consumers, usually killed by cooking. Vast numbers are, as far as we know, of no harm whatever. Alarming reports of t...

Probably the most universally known fact respecting bacteria is that they are related in some way to the production of disease. Yet we have seen that it was not as disease-produ...

fairly uniformly we count those in one of the divisions. They reach, we will suppose, the figure of 60; 60 × 8=480 micro-organisms in the amount taken from the suspected water a...

The object of modern bacteriology is not merely to accumulate tested facts of knowledge, nor only to learn the truth respecting the biology and life-history of bacteria. These a...

Surface soils and those rich in organic matter supply a varied field for the bacteriologist. Indeed, it may be said that the introduction of the plate method of culture and the...

The first scientist who demonstrated the existence of micro-organisms was Antony von Leeuwenhoek. He was born at Delft, in Holland, in 1632, and enthusiastically pursued microsc...

It was Pasteur who in 1857 first propounded the true cause and process of fermentation. The breaking down of sugar into alcohol and carbonic acid gas had been known, of course,...

The term _natural immunity_ is used to denote natural resistance to some particular specific disease. It may refer to race, or age, or individual idiosyncrasies. We not infreque...

The basis of the usual methods in practice is to pass air over or through some nutrient medium. By this means the contained organisms are waylaid, and finding themselves under f...

In entering upon a consideration of such a common article of use as water, we shall do well to describe in some detail the process by which we systematically investigate the bac...

We live in a world that is teeming with life. From the earliest times of man that life has been studied and the observations recorded. Thus there has slowly come to be a conside...