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Strong's Island, which is of basaltic formation and clothed with 

 the most beautiful luxuriance of the tropics, but where, in a 

 general way, I know that neither the above-mentioned milk- 

 weed nor its accompanying butterfly were at that time to be 

 found. 



" Some weeks after the plants had been opened on Ponape 

 (I should think it must have been three or four months) there 

 having meantime been no vessel from any other land, we discov- 

 ered several young plants of the milk-weed, springing up in the 

 earth in which various other plants had been brought from the 

 Sandwich Islands. These milk-weeds had evidently sprung 

 from seeds in the Sandwich Island earth, as we found no plants 

 of that kind after a most careful inspection of every item, when 

 the case first arrived from Honolulu, and as they were plants 

 till then unknown on Ponape, my brother Theodore and I set 

 ourselves to watching whether or not the butterfly would ap- 

 pear with it. The plants did not grow very rapidly or healthily, 

 but just as several of them were beginning to develop flower 

 buds, we discovered a swarm of small caterpillars of the Da- 

 naus, of different sizes, but none of them apparently more 

 than two or three days out of the egg, feeding on the leaves. 

 This, of course, stimulated our curiosity exceedingly. We had 

 to destroy a considerable portion of the swarm, so as to secure 

 for the remainder nourishment sufficient from the five or six 

 slender and stunted plants to permit of their maturing, for we 

 found that the caterpillars would feed on nothing else. In due 

 time the chrysalids were formed. We took charge of them, 

 showed them to the natives, and offered large rewards to any 

 one who would bring us others of the same kind, but they did 

 not and said they could not, for they were unknown on the 

 island. In about two weeks the butterflies appeared, and we 

 offered like rewards, with like results, regarding them, and as 

 Ponape has but very few butterflies of any kind, we were sure 

 they were something new. 



" We afterwards took a few of the seeds of the milk-weed, 

 carefully cleaned, to the opposite side of the island, twenty-five 

 miles as we travelled round the shore, and there planted them. 

 The plants, apparently now naturalized, grew very thriftily to 



