QUARTERLY CHRONICLE. 261 
of water, becomes turbid at 145° Fahr.; and when the tem- 
perature has reached 172° Fahr. its colour is completely de- 
stroyed. If such a blood solution have been treated with 
carbonic oxide, whilst, when the temperature has been raised 
to 172°, the albumen has separated in flakes, the blood colour- 
ing matter remains wholly unchanged. It is only when the 
temperature is raised to about 185° that the colouring matter 
commences to coagulate. The coagulum which is obtained 
on further heating is of a reddish colour, unlike that of nor- 
mal blood. Fourthly, if blood be saturated with CO, and 
evaporated to dryness at a temperature below that at which 
the colouring matter coagulates, the dry residue yields its 
colouring matter to water, and the solution presents all the 
optical properties of carbonic oxide blood. When this solu- 
tion is boiled, the compound with the colouring matter yields 
carbonic oxide gas. Fifthly, poisoning by pure carbonic 
oxide, or by the fumes of charcoal, invariably leads, before 
death occurs, to those changes which are characteristic of 
carbonic oxide blood, becoming quite irreducible. Sorby’s 
micro-spectroscope answers admirably for these investigations; 
and the solution which Dr. Gamgee recommends for this spe- 
cial process is one containing tin, in preference either to sul- 
phide of ammonium or protoxide of iron. Sixthly, whilst it 
results from Dr. Gamgee’s researches that no gas or poisonous 
agent exerts the peculiar action on blood colouring matter 
which is produced by CO, it is specially to be noticed that 
prussic acid and laughing gas, which have the power of ren- 
dering blood florid, do not prevent its being reduced. Thus, 
the question which Claude Bernard suggested some years ago, 
as to whether prussic acid exerts on blood a similar action to 
that of carbonic oxide, is answered in the negative. 
“ Remarks on the Rhizopoda of the Hebrides,” by Henry B. 
Brady, F.L.S.—The author stated that whilst the question 
was still occasionally raised as to the amount of good 
resulting from the annual money-grants of the associations 
for aiding researches in marine zoology, it was obviously the 
duty of those who had facts of interest obtained by their 
means to bring them before that section. It was with this 
view that he presented a few points concerning the Forami- 
nifera contained in Mr. Jeffrey’s dredgings in the Hebrides. 
He proposed merely to touch on the subject, leaving details to 
a future paper, when he should have had time to conclude 
his examination of the material. Of the total number of 
species and tolerably permanent varieties hitherto numbered 
in the British fauna—which might be regarded as 121— 
seventy-six had occurred in the Hebrides dredgings: In 
