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Rh Moreover, the crew and passengers may be subjected to a surveillance not to exceed six days from the date of arrival of the vessel.

32. Vessels uninfected with yellow fever shall be granted pratique immediately after medical inspection, whatever be the nature of their bill of health.

33. The measures contemplated in articles 30 and 31 do not concern the countries in which stegomya exist. In other countries they shall be applied to the extent deemed necessary by the medical authorities.

34. In applying the measures set forth in articles 22 to 33, the competent authority shall take into account the presence of a physician and of disinfecting apparatuses (chambers) on board the vessels of the three categories mentioned above.

In regard to plague, he shall likewise take into account the installation on board of apparatus for the destruction of rats.

The health authorities of nations which may deem it suitable to reach an understanding on this point may excuse from the medical inspection and other measures those uninfected vessels which have on board a physician specially commissioned by their country.

35. Special measures, especially (as regards cholera) a bacteriological examination, may be prescribed in regard to any vessel in a bad hygienic condition or crowded.

36. Any vessel not desiring to submit to the obligations imposed by the port authority in pursuance of the stipulations of the present convention, shall be free to put to sea again.

It may be permitted to land its cargo after the necessary precautions have been taken, viz:

1. Isolation of the vessel, crew, and passengers.

2. In regard to plague, inquiry as to the existence of an unusual mortality among the rats.

3. In regard to cholera, the substitution of good water in place of the drinking water stored on board, when the latter is considered suspicious.

It may also be permitted to land passengers who so request upon condition that they submit to the measures prescribed by the local authority.

37. Vessels hailing from a contaminated port and which have been subjected to sanitary measures applied in an efficient manner in a port belonging to one of the contracting countries, shall not undergo the same measures a second time upon their arrival in a new port, whether or not the latter belong to the same country, provided no incident has occurred which would involve the application of the sanitary measures contemplated hereinbefore, and provided they have not touched at a contaminated port.

A vessel shall not be considered as having stopped at a port when, without