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                                    Surra.                                  11

and remained absent till the 12th. On 12th and 13th two
more injections were made of 50 c.c. of 8 per cent. solution,
but a few days after the parasites appeared, and as the pony
was losing all the improvement which he showed under the
early treatment, he was destroyed.

A rabbit inoculated intraperitoneally with 5 c.c. of blood
from this pony on October 17th, showed parasites in the
blood four days after inoculation.

                  ATOXYL AND MERCURY.

Pony 249.—Height about 13-2 hands, body-weight 564
lbs. Surra diagnosed September 17th. Treatment com-
menced September 25th.

                            Quantity of Hg. cl2 given.

c.c.

gms.

200 Hg. cl2

(1—1,000) =

0.2 gms. Subcut.

= 0.39 gms. subcut.
and intrav.

190 Hg. cl2

( „ ) =

0.19 gms. Intrav.

                        Quantity of Atoxyl given.

c.c.

gms.

100 Atoxyl

2%

intrav.

2

= 30 gms. of Atoxyl intrav.

200 „

4%

8

250 „

8%

20

(All solutions given intravenously were filtered and heated
to blood heat before injection.)

                                            Injections.

Date.

Quantity
injected.

Hg. cl2 sol.

How
injected.

Trypanosoma
present or
absent.

c.c.

September

25th ... ...

50

(1—1,000)

Subcut.

Absent.

26th ... ...

50

(1—1,000)

27th ... ...

100

(1—1,000)

28th ... ...

20

(1—1,000)

Intrav.

Present.

29th ... ...

...

(No injection)

...

Numerous.

30th ... ...

35

(1—1,000)

Intrav.

October

1st ... ...

35

(1—1,000)

Very numer-
ous.

2nd ... ...

50

(1—1,000)

Absent.

3rd ... ...

...

(No injection)

...

4th ... ...

50

(1—1,000)

Intrav.

As the pony was losing condition, becoming weak and
emaciated, the mercury treatment was changed for atoxyl.

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