1823.] Linnean Society. 469 



meeting : — An Account of a Magnetic Balance, and of some 

 Experiments on Magnetism recently made with it. By William 

 Snow Harris, Esq. Communicated by the President. 



In consequence of the approaching festival, the Society then 

 adjourned over one Thursday, to meet again on the 29th of May. 



LINNEAN SOCIETY. 



April 1. — Remarks on a Minute Luminous Insect frequently 

 observed in the course of a voyage to India. By Major-Gen. 

 Hardwicke, FLS. &c. 



This insect, to which the author would not venture to give a 

 name, is three lines in length, by one and a half in width ; is 

 oblong, ovate, depressed, and so thin as to be semitransparent : 

 it consists of nine segments, which are all provided with hairy 

 tufts, apparently legs ; the first segment contains the head and 

 the thorax. After being taken up from the sea, it remained 

 luminous for an hour, in a bucket of salt-water ; and, for some 

 minutes, in the hand. Some of the small caiicri are luminous, 

 as well as some of the onisci ; Gen. Hardwicke considers that 

 the insect above described approaches more to the former genus 

 than to the latter one. 



At this meeting, the reading of the following paper was com- 

 menced : — Commentary on the second Part of the Hortus 

 Malabaricus. By Francis Hamilton, MD. &c. 



On April 15, and May 6, the reading of Dr. Hamilton's 

 paper was continued. 



GEOLOGICAL SOCIETY. 



May 2. — A paper was read, on the Geology of Upper Canada. 



A notice was read, on the Discovery of a large Fossil Elephant's 

 Tusk, near Charmouth, Dorset. By H. T. de la Beche, Esq. 

 MGS. 



A paper was read, entitled, " Observations on the Genus 

 Actinocamax." By J. S. Miller, Esq. ALS. 



A paper was read, on the Belemuites of the Chalk and alluvial 

 Strata of Norfolk and Suffolk, with Notices on their Localities, 

 and accompanying Fossils. By Richard Taylor, Esq. 



May lb. — A memoir was read, on the Geology of Southern 

 Pembrokeshire, from the observations of H. T. de la Beche, 

 esq. FRS. FLS. MGS. and the Rev. W. D. Conybeare, FRS. 

 MGS. &c. Drawn up and communicated by the former. 



This memoir is accompanied by a map, and extensive sections 

 of the coast. The constituent formations occurring in this dis- 

 trict are as follows, beginning with the lowermost: 1. Trap. 

 2. Greywacke. 3. Old red sandstone. 4. Carboniferous lime- 

 Coal measures. 



