323 



drawings illustrating ant life tended greatly to enhance the 

 interest of the lecture. 



A seaside trip was undertaken on May 18, when a party 

 under the leadership of the President, and Mr. A. G. Edquist 

 went along the coast from the Grange towards the Semaphore. 

 Several interesting forms of marine life were noticed and 

 described by Mr. Kimber, after which Mr. Edquist described 

 the characteristic plants of the sandhills bordering the shore, 

 and spoke on the many interesting adaptations shown by such 

 plants growing under xerophytic conditions. 



On June 1 the Director of the Botanic Garden (Mr. J. F. 

 Bailey) conducted a large party over the Garden and Botanic 

 Park. The leader dealt more particularly with the trees 

 growing in the garden, pointing out their modes of growth and 

 economic uses. 



The evening meeting held on June 18 was well 

 attended. Mr. H. W. Andrew, of the Agricultural Depart- 

 ment, gave a most interesting address on "Weeds and 

 Seed Control." By means of lantern slides and a fine collec- 

 tion of well-mounted specimens the lecturer illustrated many 

 of the most troublesome weeds which have been imported into 

 our State to the detriment of the producers, and described the 

 methods by which it was attempted to prevent the introduction 

 of fresh species and to diminish the spread of existing pests. 



The excursion of June 22 was devoted to the Morialta 

 Gorge. Under Dr. C. Fenner's leadership, and with the aid 

 of maps supplied to each member of the party, the formation 

 of the gorge was studied. The leader clearly explained the 

 physiographic factors which had brought about the formation 

 of the waterfalls, the picturesque canyon, and the many other 

 forms of rock structure to be seen in the Morialta Reserve. 



On July 6, Prof. T. G. B. Osborn, M.Sc, conducted a 

 party of members of the Section over the North Park Lands 

 at Mont en* ore Hill, and gave an interesting exposition of the 

 manner in which the common onion weed was enabled to spread 

 w r ith such destructive rapidity in pasture lands, and by means 

 of specimens demonstrated the peculiar root system possessed 

 by this plant. Several other introduced weeds were dealt with, 

 and an adjournment was made to the banks of the Torrens. 

 The formation of "hooks" was pointed out, and attention was 

 directed to the colonization of the newly-formed mudbanks by 

 various species of plants. 



At the evening meeting held on July 16, Prof. T. G. B. 

 Osborn, M.Sc, spoke on "''The Variability of Organisms." By 

 means of a card containing a number of leaves from two 

 branches of a pittosporum plant mounted to show the number 

 of leaves of each of various lengths, the speaker was able to 



