124 ANALYLES OF MAGNESIAN LIMESTONE. 
appear to have an example of this, which a succession of chemical 
tests may expose. 
Mr. Howse was good enough to direct my attention to a pe- 
culiar substance found in the magnesian limestone, which he 
thought to be flints. I have analysed these also, and find them to 
consist as under :— ; 
SHINEE, scoGooaqsdacde00 enstednacopsobBIOABSsooOOBcCHSDCES 60H 78:00 
IAUMIN aout cesicosavetawocsceerens uesunteamaeeenear estes 1°56 
Peroxide sir OT ikecseecvee cece coher eleeslee eee ee enone — 
Carbs Mam esiaedsanmscrccnece ccresteateecenenese ~ 920 
ry Imo Veaceie cae esesecueseoumnocseonoese cess 11:10 
99°80 
It is therefore not a flint (properly so called) but a mineral, 
consisting of silica and carbonates of lime and magnesia, 
which may yet require to be named. It is possible that it may 
have existed as some organic substance, of which the p:esent 
mineral may retain some of the original form. 
Another specimen of a similar substance, but much more flinty 
in its appearance, found at Fulwell, and sent me by Mr. J. W. 
Kirkby, approaches much more nearly to the composition 
of flint in the quantity of Silica, but contains a greater 
per centage of other matters than that mineral. It is composed 
as under :— 
iC acs es aistosceecesrceetccsctonenseeescmencets nae wesenecencen 96°5 
al Alumina and) Tronics cccsccnccecscncacstuencoeesoeceorenens 1:2 
Carb. taimie 02 cee comes soccanneeeeo miner vance an oeecenioee ae 16 
cy NIB YEN ESTEY coodocant6caqadoan00ccoo aD4GG HUG. sosoDDNEDOOS Trace 
99°3 
The application of chemistry to geology may sometimes throw 
a little hght on the decomposition or change of rocks, and I now 
lay these few results before you, trusting that mvestigations of 
this nature may not be altogether useless. 
XXIV.— Observations on a Species of Pycnogon (Phoxichilidium 
coccineum, Johnston), with an attempt to explain the Order of 
"ats development. By Grorcr Hopes. 
[Plates VI. & VII] 
THE generation and development of the Pycnogonoidea, to the 
best ofmy knowledge, have hitherto received a very small share 
