18 



methods of eradication will be dealt witli more fully in a later article. 

 The possibilities mentioned in this paper include starving out the 

 ticks. As, however, it has been shown that /. ricinus can live for a 

 year or more without food this method is not promising. It does 

 not follow, however, because ticks retain viability for long periods 

 that they necessarily retain infectivity ; this is one of the subjects 

 for further investigation. If it can be proved that infected ticks 

 lose their infectivity by feeding on non- susceptible animals, it would 

 be possible to get rid of infection by removing sheep from the pastures 

 and substituting other stock for one or two seasons. The difficulty 

 then arises that most of the infected pasture is unsuitable for other 

 stock than sheep. It is hoped to reduce the number of ticks greatly by 

 dipping the sheep at short intervals, such as five days. This should 

 be done during the seasonal incidence of louping-ill ; it is feared, 

 however, that among sheep affected with the disease the number of 

 severe or paralytic cases might be increased owing to the dipping. 

 It is thought that tick eradication may best be obtained by a combina- 

 tion of the above methods and trials in the field are being organised 

 to determine this. 



LiONNET (F. E.). Report on the Work of the Veterinary Division. — 



Ann. Rept. Dept. Agric.for 1917, Mauritius, t^^^. 12-13. [Received 

 31st October 1918.] 



Two fatal cases of piroplasmosis were recorded in milch cows during 

 the year. 



The importance and necessity of dipping tanks is becoming more 

 and more known and appreciated, many estates having already 

 constructed their tanks and being satisfied with the results obtained. 

 This is an important step towards the improvement of cattle-rearing 

 in Mauritius, especially in tick-infested districts. 



The Construction of Dipping-tanks. — Bept. Agric. Mauritius, Leaflet 

 no. 6, 14th March 1918, 2 pp., 3 figs. [Received 31at October 

 1918.] 



This leaflet gives fuU instructions for the erection of a dipping-tank, 

 with a .ground plan, cross section and longitudinal section drawn to 

 scale, and the estimated cost of construction. 



SiQWART (H.). Beitrag zur Zeckenkenntnis von Deutsch-Siidwest- 

 afrika, unter besonderer Berucksichtigung der Funde in den 

 Bezirken Outjo und Waterberg. [The Ticks of German South- 

 west Africa, with Special Reference to Species found in the 

 Districts of Outjo and Waterberg.] — Zeitschr. f. Infektio7iskr., 

 parasitdre Krankheiten u. Hyg. der Haustiere, Berlin, xvi, no. 6, 

 1st June 1915, pp. 434-444, 6 figs., 1 map. 



These investigations were made from September 1912 to May 1914. 

 The rapid multipHcation of ticks in this part of Africa is hindered 



