22 
are a form—unique it may be, and probably is—of pseudopodia; and, 
inasmuch as such organs have not hitherto been demonstrated on an 
undoubted diatom, I venture to give the specific name heliozoides to this 
species. 
I have noted three methods of reproduction in the Coscinodiscus 
under consideration, viz.: (a/ the ordinary method in Diatomacee ; 
(b) by liberation from the opened frustule of chromoplast embedded in 
protoplasm; (c) by detachment of portions of the granular protoplasm 
which coats the outer surface. In (b/ and /c/ methods pseudopodia are 
produced on the smallest examples, before any traceable silicification has 
taken place. Many of these young forms may be found in series, like 
tiny wheels on an axle. 
The Bournemouth surface nettings also contained other interesting 
living Diatoms, notably Biddulphia aurita, Bacillaria paradowa, Rhizoso- 
lenia, &c. Like most free diatoms, all of these evidently possess power 
of movement. How this movement is brought about has been debated 
for years past. The explanation generally accepted is that osmotic 
interchange between the cytoplasm and the surrounding media, aided by 
the lifting and floating power of the gaseous products of the various 
nutritive processes, is the cause. J am of opinion that the extrusion of 
protoplasm through pores or thin places in the envelope is far more 
frequent as the motive power. I have seen indubitable evidence of this 
in the case of Diatoms abundant on the muddy banks of the tidal reaches 
of our own River Dee during the past two summers. 
PHOTOGRAPHIC SECTION. 
This Section has held seven meetings during the Session. The 
exhibit at the Conversazione was equal both in merit and interest to 
those of any previous years. Several lectures, fully illuswrated, were 
given in the Lecture Theatre, including the following :— 
October 26th,—‘“ A thousand miles up the Irrawady,” by Mr. 
Will R. Rose. 
February 8th.—“ A ride on a City Tramcar from the General 
Railway Station to Overleigh Lodge, noting historical 
sites and buildings seen by the way,” by Mr. Frank 
Simpson. 
April 25th.—‘“ Exhibition of the Affliation of Photographic 
Societies’ Prize Lantern Slides for 1911.” Descriptive 
notes read by Mr. Frank Simpson. 
We place on record, with siucere regret, the resignation of our late 
Chairman, Mr. J. A. McMichael, B.A., B.Sc., who has left Chester. We 
also regret to state that Mr. Frank Simpson has resigned the Secretary- 
ship, which office he has filled with distinction for the past seven years. 
At the Annual General Meeting, held on Thursday, April 25th, 
Mr. Frank Simpson was elected Chairman, and Mr. P. H. Okell Hon, 
Secretary. 
LITERATURE SECTION. 
Three evenings were placed at the disposal of the Secretary of the 
Section of Literature, and he had no difficulty in securing lecturers 
equally able and willing to contribute to the entertainment of frequenters 
of the Museum. The first lecture was delivered in November by the 
Rey. R. A. Thomas, Principal of the Chester College, and the theme 
chosen by him was the “ Roman Wall.’”’ Mr, Thomas traced with pleasing 
lucidity and true scholarship the story of a structure chiefly associated 
with the name of that singularly accomplished Roman Emperor, Hadrian ; 
and few hearers could have failed to be conscious of the time and thought 
necessarily devoted to a topic far from easy of treatment, yet, in the 
competent hands of Mr. Thomas, resulting in a complete success. 
