92 
MEWS AND SUNDRIES. 
and hygiene it has ever been his lot to encounter. For years it 
enjoyed the unenviable notoriety of being a hotbed of yellow 
fever, and where cholera and other diseases stalked rampant. He 
is somewhat skeptical in regard to the prophylactic value of vac¬ 
cination with the attenuated virus in yellow fever, and says that 
pure air along with its twin sister, cleanliness, may be safely put 
down as the mortal foes to microbes of whatever form and shape 
in existence, aad considers them more certain and safer prophy¬ 
lactics than those advocated by the bactero-maniacal school.— 
Chicago Medical Times,. [Might not this theory, properly and 
thoroughly applied, be of much service in combating the ravaging 
diseases of our domesticated animals, especially hog cholera ? 
Our own personal observations would lead us to warmly advocate 
its superior worth. We kuow that it is admitted by most author¬ 
ities, so that it is not an original suggestion ; but what a travesty 
it is on science and common sense to advocate the inoculation of 
a pig in the midst of a filthy sty, or a cow in a noisome stable. 
Ed.] 
Incubation of Infectious Diseases. —Vacher divides these 
various periods into five sections, as follows: 1st. Shortest —One 
to four days—cholera (malignant), charbon, plague, catarrh and 
dissecting fever. 2d. Short —two to six days—scarlet fever, 
diphtheria, dengue, idiopathic erysipelas, yellow fever, pyrmia, 
influenza, pertussis, glanders, farcy, grease, crOup, puerperal 
fever. 3d. Medium —five to eight days—relapsing fever, vac¬ 
cinia, inoculated smallpox. 4th. Long —ten to fifteen days— 
natural smallpox, varicella, measles, rothelm, typhus fever, 
typhoid fever, mumps, malarial fever. 5th. Longest —forty days 
or more—syphilis and hydrophobia. Smallpox ceases to be in¬ 
fectious in 56 days after the appearance of the eruption; modi¬ 
fied smallpox in 35 days; chicken pox in 17 days; measles in 27 
days; rothelm in 14 days; scarlet fever in 49 days; typhus fever 
in 21 days; typhoid in 28 days, and mumps in 21 days.— Med. 
World. ' 
Salt. —From our familiarity with the value of salt as a con¬ 
diment, and with its utility in the persevation of meat, it may 
readily occur to us that there are still other applications of this 
substance that are worthy the attentiou of physicians and sanita- 
