124 



telluric conditions as does the yellow fever in man, to which in many 

 Avays it bears a close resemblance. The history of tlie disease is given 

 for the most part by means of extracts from the reports of the United 

 States Department of Agriculture. 



Part II : Etiology (pp. 2i2-12(>). — ITnder this head the author gives 

 at considerable length his views of the causes of the disease, espe- 

 cially in connection with observations made during outbreaks at 

 Tekamah and Roca, Nel)raska. In his opinion the disease is spread 

 among Northern cattle by the pollution of trails and pastures with 

 the excreta of diseased Southern cattle, princii^ally from Texas. 



The period of incubation in tlie Sonthcn-n cattle-i)lague is given as 

 " certainly under tifteen days." From ten instances in which the 

 dates are given, 55 to 58 days is found to be the average time between 

 the arrival of Texas cattle and the outbreak of disease among North- 

 ern stock. 



The author claims to have found the germ of the Southern cattle- 

 plague in the blood, gall, urine, liver, spleen, and kidneys of every 

 diseased animal on Avhich he made an autopsy. The germ was culti- 

 vated in an absolutely pure form in artificial media. The same germ 

 Avas found in the tissues and organs of gophers, or ground-squirrels, 

 inoculated with such cultivations, as well as in the tissues of cattle 

 inocidated with pure ctiltures. It is described as ovoid in form (with 

 a longitudinal diameter about twice that of the transverse), motile in 

 culture media, and in length about one-sixth the transverse diameter 

 of a red blood cell. 



A close resemblance between the germ of t'le Southern cattle-plague 

 and that of yellow fever in man is asserted by the author after an 

 examination of tissues from several cases of yellow fevei'. 



Fart III : Nature of the Southern cuttle -placjue and yellow fever' 

 (pp. 127-101^). — The similarity of these two diseases in their local 

 origin and lesions and in the morphology of their micro-organismal 

 causes is dwelt upon. Foi- the prevention of the Soitthern cattle- 

 jDlague the author advises that Southern cattle shoidd not be allowed 

 to be im])orted into or transported over a Northern State between 

 March- and November of each year. As this is the season Avhen it is 

 most profitable to feed these cattle, they may be admitted by requiring 

 that Southei-n cattle l)e quarantined at some given point outside of 

 the most noi'thern limit whei-e the disease exists, for a period, to be 

 determined l)v exjDeriuKuit. which will insure their freedom from all 

 disease-producing elements. Thirty clays are thought to be a sufficient 

 period for this quarantine. The quarantine station should be main- 

 tained by the National Government, and might also serA^e as a place 

 for research. In permanently infected regions the author is qttite sure 

 that the disease can be preA'ented by inoculation. 



The corn stalk d}j<ease in eattle (pp. 1G5-210). — Various theories 

 concerning the origin of this disease are discussed, and the author's 

 own inA'estigations are given in. considerable detail and compared Avith 



