310 
SUSPECTED POISONING OF A DOG. 
occurs in disease^ and disappears on the patienL^s re¬ 
covery. 
^‘The author once treated a case of cerebral disease in which 
vision was previously perfect, but during the attack the 
patient confounded several tints with each other. The colours 
mistaken for each other in this instance were in general the 
complementary ones, red being mistaken for green, and 
orange being confounded with blue'; of the physical cause 
of this remarkable state, however, nothing is known.^-’ 
It has been said, the power of distinguishing colours is not 
enjoyed but by few persons, although their visual organs 
are perfect in other respects. An uneducated eye can convey 
to the brain no peculiar property of the object seen, such as 
colour, form, and distance—it is acquired by education. We 
see this in all young animals, and young children also. The 
hands and fingers of children are essentially useful; they feel 
the objects placed before them in order to learn their pecu¬ 
liarities. Persons born blind and restored to sight in after¬ 
life have recourse to the same means to accomplish the 
desired end. Colts and young calves generally employ their 
nasal organs for the same purpose, and so do most other 
animals with which I am acquainted. 
{To he continued^ 
CASE OF SUSPECTED POISONING OF A DOG. 
By B. A. Kettle, M.R.C.Y.S., Market Drayton. 
My dear Sir, —Having lost a well-bred greyhound, 
twelve months old, under what I conceive circumstances 
calculated to excite suspicions of foul play, I forwarded to 
you, per London and North Western Railway, on Saturday 
last, the whole of the abdominal viscera, together with the 
heart and lungs, for your examination, and opinion, if you 
will do me the kindness to give it me. 
The subject of my communication was a black dog, in 
fine condition. Fie had been fed since I became his owner, 
which is about ten months, upon raw flesh, Indian meal, 
a'nd milk, chiefly. Occasionally this diet was varied with 
paunches, bones, and potatoes, and up to Tuesday, the 31st 
of March, he appeared in perfect health and spirits. On 
the morning of that day he seemed as usual, and took his 
food as well; but at 4 p.m. my pupil discovered him coiled 
