452 Geological Society. 



all the bodily actions in which the concurrence of both is required, such 

 as running, jumping, playing at battledore and shuttlecock, they ex- 

 hibit a wonderful consent, or agreement, without the appearance of 

 any previous communication of their intentions. The intellectual 

 powers of each are nearly equal ; and they have both attained the 

 same degree of proficiency in the games of chess, draughts, and whist. 

 They both possess great powers of imitation. In their respective phy- 

 sical constitutions, however, several differences are observable. Chang, 

 as the boy on the left is named, has more vigorous health, and greater 

 regularity of functions, than his brother, whose name is Eng. In ge- 

 neral they take their meals, and obey the calls of nature, at the same 

 time. The author details the circumstances of a catarrhal complaint 

 which attacked both of them in December last, the symptoms and pro- 

 gress of which were similar in each ; and from which they both reco- 

 vered in the same manner and at the same time. In their healthy 

 state their pulses are generally alike, and are easily excited ; but that 

 of the one may be accelerated, while that of his brother continues 

 calm. 



In their habits they are very cleanly and delicate j in their disposi- 

 tions affectionate and grateful for every kindness shown to them. 

 There exists between them the most perfect harmony. They always 

 fall asleep at the same moment ; and it is impossible to wake the one 

 without also waking the other. The author adverts in the course of 

 the paper to the question, whether they were the produce of a single 

 or double ovum, and also to the possibility at some future time of ef- 

 fecting their separation with safety to themselves ; and he concludes, 

 by bearing testimony to the uniformly kind treatment they have re- 

 ceived from Captain Coffin, Mr. Hunter, and Mr. Hall, who have 

 evinced on all occasions the greatest anxiety for their welfare and hap- 

 piness; and to the liberal manner in which they have always afforded 

 access to men of science, for promoting any object of philosophical 

 inquiry*. 



GEOLOGICAL SOCIETY. 



March 19th. — Henry Rowland Brandreth, Esq. of the Royal 

 Engineers, Woolwich ; Sir Thomas Phillips, Bart, of Middle Hill, 

 Worcestershire ; and Robert Alfred Cloyne Austen, Esq. of Lin- 

 coln's Inn, — were elected Fellows of this Society. 



Extracts were read from a paper entitled "Reference to a Geo- 

 logical Map and Section of Pembrokeshire, " by Alfred Thomas, 

 Esq., Mineral Surveyor, Haverfordwest. 



The author accompanies the map and section with geological 

 and economical remarks. The map comprehends all that north- 

 ern part of Pembrokeshire not described by Mr. De la Beche, and 

 the section is drawn from St. Govvan's Head on the south to Car- 

 digan on the north. Tlie alternations of the different formations 

 in the county are detailed in a scries of descriptive sections : the 

 chief masses are coal measures, including culm and coal grits, 

 mountain limestone, old red sandstone and conglomerate, tran- 

 sition 



