380 Annual Report. 



procure, if possible, extracts of the log-books of all ships which' 

 found the Cape of Good Hope, indicating the character of the 

 winds and weather which they experience. The Sub -committee 

 has been favored with some valuable communications of this 

 nature. But generally speaking, masters of vessels have 

 declined taking the trouble of making the requisite extracts. 

 From the results of such investigations, in regard to the 

 Northern Atlantic, the knowledge acquired from these observa- 

 tions may be of very great practical use. As tempests of great 

 severity are generally local, occupying a comparatively small 

 district at any given time, but appear to change their locality, 

 at rates and in directions which experience and observation may 

 determine, it is clear, therefore, that the sailor may learn to 

 avoid encountering them, or may be able so to shape his course 

 as in a great degree to avoid their violence, and he should 

 therefore be expected to lend his aid to elucidate the laws 

 which influence their origin and character. We may perhaps 

 anticipate the time, when along the peopled coast of the world, 

 intelligence of the great and dangerous commotions of the 

 atmosphere may precede their arrival, or the tempest may be 

 telegraphed, and its violence prepared for. During the destruc- 

 tive gales which sometimes oCcur here in November or Decem- 

 ber, indications of so unusual an event, as a winter tempest 

 piercing through the South-easter, must have been observed at 

 points of the coast North or South of this before they arrive to 

 Avreck the shipping in our bay. The Council would recommend 

 that the particulairs of all such gales as hive been recorded 

 should be collected and compared. 



As to Miscellaneous Objects — Dr. Muruay communicated 4 

 paper on Vaccination, in which, are detailed observations, 

 tending to show, that the system of children in early infancy 

 is generally less susceptible of the vaccine influence than 

 afterwards. 



Dr. Adamson read a paper on the Logic of Elementary 

 Geometry, detailing the steps necessary for rendering treatises 

 on that science strictly natural and logical in their arrangement. 



Mr. VON LuDwiG has communicated the following notice, by 

 Mr. Bowie, of the state of the Ludwigsburgh Garden : In the 

 month of September 1834, the genera of plants growing there 

 amounted to 497, containing 1353 species, exclusive of the 

 varieties and sub-varieties of fruit and other trees. 



Since the abovementioned period, 214 additional species havfe 

 been raised from seeds, 124 trees, shrubs, &c. have been intro- 

 duced from England, Brazil, Australia, and Mauritius, and 10 

 species of trees, shrubs, and herbaceous plants, from Hamburg. 

 On the whole there are now in the Garden 1G98 species. 



Among the many interesting plants thus introduced, are the 



