18 
MEXICO AND OTHER COUNTRIES OF NORTH AMERICA 
BELOW THE SOUTHERN CATTLE QUARANTINE LINE. 
HORSES. 
Regulation 47.— Paragraph 1. All horses infested with ticks are 
prohibited from entering the United States from the Republic of 
Mexico and other countries of North America below the southern 
cattle quarantine line when destined to an area in the United States 
from which cattle are excluded by the Federal or State authorities 
on account of ticks, unless and until such tick-infested horses are first 
dipped or otherwise treated as hereinafter specified in this regulation. 
Paragraph 2. Horses that can be handled and inspected for ticks 
shall be so inspected at the port of entry. The importation of un- 
broken horses (i. e., those which are not gentle and are not broken 
for saddle, harness, or work) destined to an area from which cattle 
are excluded by the Federal or State authorities on account of ticks, 
is prohibited unless the horses are first dipped as hereinafter speci- 
fied in this regulation for tick-infested horses. However, if horses 
intended for importation into the United ' States are held for six 
months immediately preceding the date they are offered for importa- 
tion, on premises known to be free from ticks, they may be admitted 
for any destination without dipping. Horses from Mexico belong- 
ing to Indian tribes and settlers and those used in stock raising (cow 
ponies) or mining, and those for temporary stay at points along the 
frontier not to exceed two weeks, whether for pleasure, driving, or 
teaming, may be admitted into the United States without inspection, 
provided they are not entered, moved, or permitted to enter into any 
portion of any State or Territory into which the movement of cattle 
is prohibited by the Federal or State authorities on account of ticks. 
Paragraph 3. The dipping required for tick-infested horses shall 
be done in Beaumont crude petroleum or standard arsenical solu- 
tion, or the horses shall be otherwise treated in a manner approved 
by the Secretary of Agriculture. 
Paragraph 4. Horses admitted in bond for export from the United 
States shall be subject to inspection at any point at which the depart- 
ment has inspectors stationed. 
Paragraph 5. Standard arsenical solution. In preparing each 500 
gallons of the standard arsenical solution there shall be used 10 
pounds of finely powdered white arsenic containing not less than 99 
per cent of arsenic trioxid, 25 pounds of sal soda, and 1 gallon of pine 
tar. The arsenic and sal soda shall be boiled together in not less than 
25 gallons of water for 15 minutes, or longer if necessary, to effect 
complete solution of the arsenic. Before the pine tar is added the 
temperature of the solution shall be reduced to 140° F. This 
