out, in which 1 1 cases of Strangles with sub-maxillary abscesses and 23 cases of Catarrhal Fever due to the streptococcus occurred, the results of the vaccination would appear to be benificial in preventing the spread of the disease.

It will be possible to form a better opinion of the value of the vaccination later.

(iv) Trypanosomiasis.

The following types of trypanosomes have been identified up to the present :— Trypanosoma soirdanense of camels—wide distribution. Trypanosoma pecaudi. One natural case of this trypanosome has been encountered in a mule from the Bahr-el-Ghazal. It causes an acute, fatal equine Trypanosomiasis which, up to the present, has not been successfully treated, (see case (iii) and (iv) in this report on research. Morphologically it is classed in the dimorphic group of trypanosomes, but pathogenically it is probably closely allied to the Trypanosoma brucei Trypanosoma congoleuse, and nan urn. These two types are morphologically very similar, but are distinguished by the fact the '1'. congoleuse is pathogenic for the laboratory animals, whereas T. nanum is non-pathogenic.

It is therefore not possible to differentiate between these two trypanosomes by microscopic examination alone.

The only two case (cases (i) and (ii) research) which were available for inoculation proved to be T. nanum.

Two cases of T. nanum infection have been seen in equines, one in a horse from Mongalla (case (i)), and one case in a nude from the Bahr-el-Ghazal (case (ii)).

In cattle T. nanum has been diagnosed in Mongolia (2 cases), in Kassala near Gedaref (4 cases), and in Kordofan (2 cases).

From the reports, the disease appears to take a sub-acute form both in equines and cattle.

Trypanosoma vivax. Four cases of 4'. vivax have been diagnosed in blood from cattle in Mongalla, the smears being sent by K1 Bimbashi Ellison.

The disease appears to be sub-acute. El Bimbashi Ellison reports that the animals were very debilitated, but that they had been sick for four months.

Trypanosoma cazalboui (vivax) has been reported once before in the Sudan by Balfour, as occurring in Kassala, but the disease in Kassala was said to be acute, causing the death of the cattle in 7 to 10 days.