_January 1873._ San Antonio (3d) _Tex._; Cheyenne, _Wyo._; Cimarron, (1st week), Elizabeth City (2d week), Alberquerque (4th week), _N. M._; Salt Lake City, (2d week), Corrinne (3d week), _Utah_; Santiago, _Cuba_. _February._ Brownsville (3d week) _Tex._; Winnemucca, _Nev._; Monterey (1st week), _Mex._ _March._ Prescott (1st week), Tucson (2d week), Yuma (4th week) _Ariz._; Boise City, (3d week), _Ida._; Helena (4th week) _Mont._; Virginia City, (1st week), _Nev._; Carson City, _Nev._, Santa Barbara, Visalia, _Cal._; Guaymas, Mazatlau, Manzanillo, _Mex._ _April._ San Diego (1st week), Mariposa, Stockton, San José, Oakland, Sacramento, Marysville and Shasta (2d week), San Francisco, Vallejo, Nevada City and Weaverville (3d week), and Lava Beds, _Cal._ (4th week); Baker City (2d week), Jacksonville, _Ore._ (4th week); Walla Walla, _Wash._ (4th week); Acapulco (1st week), _Mex._ _May._ Eugene City, (3d week), Dallas and Portland, _Ore._ (4th week); Olympia, _Wash._ _June._ Seattle, _Wash._ (3d week). _July._ Guatemala City, Guatemala (2d week), Victoria, _B. C._ _August._ La Union, _San Salvador_ (1st). Among the deductions from this record are: 1. The affection advanced gradually from Toronto over the whole continent of North America, where horses are kept, taking full ten months to accomplish this. Nothing checked its advance, over lowland and highland, swamp and arid land, in summer as in winter, with a temperature at 0° or at 100° F., in country pasture or in city street or stable, idle or overworked, on all kinds of soils and geological formations, under all successive conditions of meteoric and terrestrial electricity, in all conditions of the air—pure, impure, dense, light, moist and dry. No one condition of the environment operating on the animal system, can be conceived of that could advance as this disease did from place to place in regular sequence for this length of time.