562 
Tertiary Entomostraca, p.p. 29 and 44, pi. iv., figs. 6 and 7,) 
Cytheridea Sorbyana and Cytherea concinna, neither of 
which have hitherto been met with anywhere else, either 
living or fossil. 
ON COLLIERY VENTILATION. BY RICHARD CARTER, ESQ., 
C.E., OF LONG CARR, BARNSLEY. 
In assenting to bring before the West Riding Geological 
and Polytechnic Society the subject of Colliery Explosions 
in connection with the sad occurrence at Lund-hill, in this 
neighbourhood, on the 19th February last, I cannot but feel 
deeply the important bearings of the question, and its peculiar 
claim to be brought before this Society — whose province it 
is to promote or encourage any means by which mining 
operations may be harmonised with the advancing steps 
of progressive science ; to dissipate the miasma of un- 
educated prejudice, and to present the standard of practical 
wisdom and truth. 
I have ventured to put forth my humble ability, well 
knowing that if I only elicit the interchange of a moderate 
amount of sentiment, on the part of those members of 
the Society whose practical acquaintance with the subject 
so eminently qualifies them for its discussion, and so 
discharge the battery of thoughtful speculation and re- 
flection which the Lund-hill calamity has been the means 
of most naturally creating, I shall have done some service 
to the cause of humanity, as well as of practical science as 
applied to mining operations ; and so have acquired ample 
reward for, and justification of, the step which I have reluc- 
tantly taken in appearing before you to-day. 
It is not surprising that a catastrophe by which nearly 200 
of our fellow mortals were instantaneously swept out of life 
into the stillness of death, should have induced the expres- 
