_Pneumo-bacteria._--Two forms of organism associated with
pneumonia--_Fraenkel's pneumococcus_ (one of the diplococci) (Fig. 5)
and _Friedländer's pneumo-bacillus_ (a short rod-shaped form)--are
frequently met with in inflammations of the serous and synovial
membranes, in suppuration in the liver, and in various other
inflammatory and suppurative conditions.

_Bacillus Typhosus._--This organism has been found in pure culture in
suppurative conditions of bone, of cellular tissue, and of internal
organs, especially during convalescence from typhoid fever. Like the
staphylococcus, it is capable of lying latent in the tissues for long
periods.

_Other Pyogenic Bacteria._--It is not necessary to do more than name
some of the other organisms that are known to be pyogenic, such as the
bacillus pyocyaneus, which is found in green and blue pus, the
micrococcus tetragenus, the gonococcus, actinomyces, the glanders
bacillus, and the tubercle bacillus. Most of these will receive further
mention in connection with the diseases to which they give rise.

#Leucocytosis.#--Most bacterial diseases, as well as certain other
pathological conditions, are associated with an increase in the number
of leucocytes in the blood throughout the circulatory system. This
condition of the blood, which is known as _leucocytosis_, is believed to
be due to an excessive output and rapid formation of leucocytes by the
bone marrow, and it probably has as its object the arrest and
destruction of the invading organisms or toxins. To increase the
resisting power of the system to pathogenic organisms, an artificial
leucocytosis may be induced by subcutaneous injection of a solution of
nucleinate of soda (16 minims of a 5 per cent. solution).