C. L. Walton 
241 
and it was generally possible to obtain infected snails from such 
land. There exists a practice, I am informed, of placing infected 
sheep on good pasture, etc., to be “flushed” prior to their being 
offered for sale, as this greatly assists in “clearing” the eyes, at 
any rate temporarily. 
6. Some farmers, and owners, have eliminated the disease from 
their land by drainage, and on many places this can be effected 
with comparatively little trouble and expense, whereas on 
others, it would prove to be a task of great difficulty. 
7. The shepherd in charge is frequently able to prevent, or at least 
mitigate the losses from rot to a considerable extent, and many, 
without being aware of the true cause, yet know that rot follows 
grazing on wet land. They may even go further, and suspect, 
or actually accuse, some definite spot, and either endeavour to 
prevent sheep grazing there, or will “cull” those that make a 
habit of feeding on that particular ground. It is well known that 
certain sheep will develop a taste for the herbage of wet spots 
(often locally called “wells”) and remain there persistently, 
and they are in consequence especially liable to contract the 
disease. One old shepherd likened this habit to “taking to 
drink.” It will be observed that the precautions listed vary 
with the degree of infeotion, whether slight, partial, considerable, 
or severe. 
8. It is the custom, on some farms that suffer from rot, to turn 
their sheep, or give them access to a dry bank by night, and it 
is claimed that, this procedure greatly mitigates the trouble. It 
is simply allowing or following out the movement naturally 
performed by sheep when conditions allow them sufficient freedom. 
Seventy three distinct localities inhabited by Limnaea truncatula 
were discovered within the Area during the progress of the 
Survey, and after comparing my map of these spots with his map 
of the surface Geology, Prof. 0. T. Jones finds that practically 
the whole are situated upon clay. 
The correlation between the presence of clay, L. truncatula and 
rot is therefore very marked. 
9. During my enquiries I met several farmers in whose flocks a 
case of rot may occur now and again, and who then promptly kill 
the sheep as soon as they detect the symptoms, believing that 
such is a preventive measure. There is no doubt that such 
action may be very wise, one owner tracing all his trouble to the 
