PROCEEDINGS 1841 — 1848. 
199 
states that Captain Brown, of Manchester, has enumerated 12 species 
of unios under the genus Pachyodon,"' viz., six from Low Moor, five 
from Middleton, and one from Wakefield, The Crustacea are restricted 
to one small creature, Cypris arcuata, which occurs along with the 
unios. The total remains found in the Yorkshire coal-field are stated 
to be, of fish 17 species, cephalopods 5, mollusca 17, Crustacea 1, 
total 40. 
Several interesting papers were read on subjects that do not 
appear to have been contemplated as within the scope of the Society 
at its formation, but which nevertheless are of considerable interest. 
Amongst others, Dr. Alexander, of HaKfax, read a paper on disinfect- 
ing agents, in which, after enumerating the several disinfectants at 
that time available, he expressed the opinion that chloride of lime stood 
before all others in efficacy. Mr. James Hey wood, of Sheffield, also 
read a paper on Malaria and disinfectants; and a second one on the clover 
sickness of certain soils, an investigation into the causes producing 
the failure of the red clover crop, in which he expresses the opinion 
that the failure of clover is owing to a deficiency of soluble potash in 
the soil at the time the plant requires this material, and he advocates 
the application of stable manure so as to restore the potash (taken 
from the plants by the animals), to it. ^Ir. West contributed a 
paper on the action of certain waters in forming incrustations in 
boilers, gave some analyses, and recommended the application of 
chloride of calcium for preventing incrustation. Mr. Henry Briggs 
contributed a paper recommending the growth of flax in Great Britain 
and Ireland to take the place of cotton, giving a number of statistics 
to show that its growth and manufacture would be a great benefit to 
the country, and would afford more employment to the workpeople, 
in proportion to the money expended, than the growth of cereals. 
* See Transactione, Manchesttr Geological Society. 
