238 Report of the Field and Feeding Experiments 
latent form, and animals that have cohabited with the diseased 
are not suspected when they are even capable of spreading the 
contagion. 
In carrying out the regulations of the Contagious Diseases 
(Animals) Act relating to pleuro-pneumonia, in many cases 
the local authorities are satisfied with the slaughter of the 
actually diseased animals, and the disinfection of the stalls 
where they stood. The premises are declared an infected place, 
but no further notice is taken of the apparently healthy animals 
until another case is reported. A careful examination of the 
whole of the stock would often lead to the detection of the dis- 
ease in some animals at a very early stage, and their separa- 
tion from the rest of the herd would in many cases prevent the 
further spread of the virus. 
Sheep-scab has prevailed to a considerable extent in many 
parts of the country, more particularly in Wales and York- 
shire ; during the last quarter of the year no less than 1060 
cases were reported in the East and some 770 in the North 
Riding. 
In Somerset, also, there have been 640 cases recently ; while 
in some other counties where sheep-farming is carried on 
extensively this malady is almost if not quite extinct. 
X. — Report of the Field and Feeding Experiments conducted at 
Wohurn, on behalf of the Royal Agricultural Society of England, 
during the year 1877. (Presented to the Chemical Committee, 
December 11, 1877.) 
The Experiments on the Continuous Growth of Wheat. 
Stack-yard Field. — The wheat crop of 1876, grown b/the late 
tenant, yielded per acre — 
25^ bushels dressed corn. 
20^ cwts. straw. 
The seed of the first experimental crop was sown during the 
first week of November (1876). The description selected was 
Browick, being that usually grown in the neighbourhood. The 
dung and the mineral manures were applied before the seed 
was sown. The salts of ammonia and nitrate of soda were top- 
dressed in the spring. 
The produce obtained is given in the following table : — 
