72 Iodine. — Rare Plants. — Cuckoo. — Tunnel. 



cury will pass again into the minute tube, and, by cohesion, 

 will draw an additional portion after it out of the paper cavity, 

 until the whole tube is filled at the common temperature of 

 the air of the room. The bulb should be placed in water of 

 the temperature to which the thermometer is desired to rise, 

 which will cause the superfluous quicksilver to flow out at the 

 top. The capillary tube may then be hermetically sealed 

 and fixed on a graduated scale. The thermometer of this 

 kind, exhibited on this occasion, was made by Dr. Francis 

 Fox." 



IODINE IN MINERAL WATERS. 



Dr. Cantu has proved the existence of iodine, in the state of 

 hydriodate, in the sulphureous mineral waters of Castelnuovo 

 d' Asti. He infers, as a probability, from his experiments, that 

 iodine is a constituent part of all sulphureous waters which 

 contain muriates ; and to this he attributes the medical efficacy 

 of these waters in diseases of the glandular and lymphatic 

 systems. — [Giornale di Fisica.) — Dublin Phil. Journ. 



DISCOVERY OF RARE BRITISH PLANTS. 



The Cistus Surrejanus has been found this year on the bor- 

 ders of a wood on the Addington Hills near Croydon, by 

 Mr. W. Christy junior, who has also found abundantly, in the 

 same locality, another plant, not generally admitted to a place 

 in the British Flora, namely, Dianthus barbatus. 



ATTACHMENT OF A THRUSH TO A CUCKOO. 



The following anecdote of the attachment of a thrush to a 

 cuckoo is too extraordinary to pass unnoticed. — About a montlv 

 since a young cuckoo was taken from the nest of a hedge- 

 sparrow, and a few days after a thrush, scarcely fledged, put 

 into the same cage. The latter could feed itself, but the cuckoo 

 its companion was obliged to be fed with a quill ; in a short 

 time, however, the thrush took upon itself the task of feeding 

 its fellow prisoner, and continues so to do with the utmost 

 care ; bestowing on the cuckoo, which is nearly twice as large 

 as its foster parent, every possible attention, and manifesting 

 the greatest anxiety to satisfy its continual cravings for food. 

 The birds are in the possession of Gideon Mantell, Esq. of 

 Castle-place, in this town. The correctness of this statement 

 is, therefore, unquestionable. — Leives Paj>er, June 25. 



TUNNEL AT ROTHERHITHE. 



At the concluding Friday-evening meeting at the Royal 

 Institution, on the 9th of June, an account was given of the 



present 



