324 Wisco)isin Academy of Sciences, Arta, and Letters. 



cies occur at various otlier places along the north shore, and Avi- 

 cennia was found in one instance to be {^rowing in a sunken 

 place, a short distance inland, which was apparently filled with 

 sea water at high tide. 



The interior is barren in many places where there are expos- 

 ures of lava. With the exception of a few low stunted trees of 

 Bursera graveolens, a low Opuntia, and scattered bushes these 

 beds bear no other vegetation. The species of Opuntia is possibly 

 a new one as it differs quite markedly f loiu the other species in 

 this genus which occur on these islands. It also occurs on South 

 Seymour Island, a few miles away, but at neither place were the 

 specimens in good shape at the times these were visited. Occa- 

 sional bushes of Acacia macracantha, and thickets of Croton 

 bushes occur in small patches between the lava beds, where there 

 is a sufficient amount of soil to support them. Grassy areas oc- 

 cur, between the patches of bushes, which are usually covered 

 with Aristida subspicata. These areas continue at intervals, to 

 an elevation of 1,000 ft. as high as this side of the mountain was 

 explored. Very little change takes place in the character of the 

 vegetation at this elevation, except that some of the species grow 

 to a larger size than thej- do lower down. This is espe^cially true 

 of Bursera graveolens, and Piscidia Erythrina, both of which are 

 <iuite small near the shore but form trees in the interior. 



The dry region extends to possibly an elevation of 1,500 ft. on 

 this side of the mountain, as the appearance of the vegetation 

 did not appear to change for several hundred feet above where 

 exploration was discontinued. The moist i-egion seems to form 

 a narrow zone just below the top on this side of the mountain. 



Northwest Side. 



This side of the island was visited at a place about two miles 

 south of Conway Bay, which is marked by a small tufa crater 

 near the shore. Our reason for stopping here instead of at Con- 

 way Bay, the usual place for landing on tliis part of the island, 

 was because we had learned at Chatham Island that an old trail 

 led into the interior from this point. 



The coast is low in this vicinity, and is made up of sand 

 beaches and low cliff's. A flat area surrounds the tufa crater, 

 mentioned above, covered with a soil composed largely of volcan- 

 ic ashes, which have evidently originated from the crater. This 



