latter I had frequently seen in Ceylon, where it is used
medicinally by the native doctors; but here it was ignored,
except for the produce of a beautiful silky down which is used
for stuffing cushions and pillows. This vegetable silk is
contained in a soft pod or bladder about the size of an orange.
Both the leaves and the stem of this plant emit a highly
poisonous milk, that exudes from the bark when cut or bruised;
the least drop of this will cause total blindness, if in contact
with the eye. I have seen several instances of acute ophthalmia
that have terminated in loss of sight from the accidental rubbing
of the eye with the hand when engaged in cutting firewood from
the asclepias. The wood is extremely light, and is frequently
tied into fagots and used by the Arabs as a support while
swimming, in lieu of cork. Although the poisonous qualities of
the plant cause it to be shunned by all other animals, it is
nevertheless greedily devoured by goats, who eat it unharmed.

It was about two hours after sunset when we arrived at the steep
bank of the Atbara river. Pushing through the fringe of young
dome palms that formed a thick covert upon the margin, we
cautiously descended the bank for about twenty-five feet, as the
bright glare of the river's bed deceived me by the resemblance to
water. We found a broad surface of white sand, which at that
season formed the dry bed of the river. Crossing this arid bottom
of about 400 yards in width, we unsaddled on the opposite side,
by a bed of water melons planted near a small pool of water. A
few of these we chopped in pieces for our tired donkeys, and we
shared in the cool and welcome luxury ourselves that was most
refreshing after the fatigue of the day's journey. Long before
our camels arrived, we had drunk our coffee and were sound asleep