Some remarks were made by Messrs. H. C. Russell and J. F, 



The thanks of the Society were accorded to Mr. Tebbutt for his 

 valuable paper. 



Mr. Kyngdon also read a paper by Mr. Thomas Whitelegge. on 

 " The Marine and Fresh- water Invertebrates of Port Jackson and 

 the neighbourhood." 



In conveying the thanks of the meeting to Mr. Whitelegge, 'the 

 Chairman presented the Society's medal, which together with a 

 money prize of £25 had been awarded to him for his paper. 



Mr. Whitelegge duly responded. 



Prof. Stuart referred to Mr. Whitelegge's remarks respecting 

 the difficulty he had laboured under, in preparing his paper, from 

 the want of certain necessary books upon the subject, which could 

 not be obtained in Sydney. He stated that at his (Prof. Stuart's) 

 instigation a general catalogue had been made of the various 

 scientific periodicals contained in the principal libraries of Sydney; 

 this would shortly be published and he had no doubt would prove 

 of great service to scientific workers, by showing what books were 

 in the city and where they could be found. 



Professor Anderson Stuart showed a modification of the Kymo- 

 scope which he exhibited at the Society's last monthly meeting. 

 This form demonstrated the phenomena of interference in wave 

 motion— one series of tubes had one wave, a parallel series had 

 the other and both opened into a common series in which the 

 interference was made visible. The two ^ 



ivhich could l 



! from pumps 



iiplitude of the i 



as also the phase in which the waves came togethe 



Mr. Russell congratulated Prof. Stuart upon his very successful 

 and valuable invention of the 'Kymoscope' and the chairman 

 tendered the thanks of the Society for the exhibit. 



The meeting was adjourned till the first Wednesday in August. 

 The following donations were laid upon the table and 

 acknowledged :— 



Donations Received during the Month of June, 1889. 



(The Names of the Donors are in Italics.) 



TEANSACTIONS, JOUENALS, EEPOETS, &c. 



Aberdken— University. Calendar for the year 1889-90. The University. 



Adelaide— Eoyal Society of South Australia. Transactions 



and Proceedings and Eeport, Vol. xi., 1887-8. The Society. 



Urisbane— Eoyal Society of Queensland. Proceedinffs. Vol. 



VI., Parts ii. and iii., 1889. 

 Calcutta— Asiatic Society of Bengal. Journal, Vol. lvi . 

 Part ii.. No. 5, 1887. Vol. lvii.. Part ii.. No. 4, 1888 

 Proceedings, Noa. 9 and 10, 1888. 



