0, without
the addition of any bromide.

More pleasant to work with is Dr. Stolze's potassa developer. No. 1:
Water, 200 c.c.; chem. pure potassium carbonate, 90 gr.; sodium
sulphite, 25 gr. No. 2: Water 100 c.c.; citric, 11/2 gr.; sodium sulphite,
25 gr.; pyrogallol., 12 gr. Solution No. 2 is for its better keeping
qualities preferable to Dr. Stolze's solution.[A] The solutions when in
well stoppered bottles keep well for some time. To develop, mix 100 c.c.
of water with 40 min. of No. 1 and 50 min. of No. 2. The picture appears
quickly and more vigorously than with iron oxalate. If it is desirable
to decrease the density of the negatives, double the quantity of water.
The negatives have a greenish brown to olive-green tone. A very fine
grayish-black can be obtained by using a strong alum bath between
developing and fixing. The same bath after fixing does not act as
effectual in producing the desired tone. A bath of equal volumes of
saturated solutions of alum and ferrous sulphate gives the negative a
deep olive-brown color and an extraordinary intensity, which excludes
all possible necessities of an after intensification.

[Footnote A: 100 c.c. water; 10 c.c. alcohol; 10 gr. pyrogallol; 1 gr.
salicylic acid.]

The sensitiveness with this developer is at least equal to that when
iron developer is used, frequently even greater.

The addition of bromides is superfluous, sometimes injurious. Bromides
in quantities, as added to ammoniacal pyro, would reduce the
sensitiveness to 1/10 or 1/20; will even retard the developing power
almost entirely.

Must a restrainer be resorted to, 1 to 3 min. of a 1:10 solution of
potassium bromide is quite sufficient.

* * * * *

THE PREPARATION OF LARD FOR USE IN PHARMACY.

[Footnote: Read at an evening meeting of the Pharmaceutical Society of
Great Britain, November 7, 1883.]

By Professor REDWOOD.

I have read with much, interest the paper on "Ointment Bases,"
communicated by Mr. Willmott to the Pharmaceutical Conference at its
recent meeting, but the part of the subject which has more particularly
attracted my attention is that which relates to prepared lard. Reference
is made by Mr. Willmott to lard prepared in different ways, and it
appears from the results of his experiments that when made according to
the process of the British Pharmacopoeia it does not keep free from
rancidity for so long a time as some of the samples do which ha