38 CELLULAR STRUCTURE OF THE RED BLOOD-CORPUSCLES. 
There are not many veterinary surgeons who, like Mr. 
Gamgee, are skilled in the practice of the farriery, and 
without manual tact and skill, which can only be acquired 
by work, we doubt if the professional man's interference with 
tke workman would be advantageous to either. And even 
when the head of an establishment possesses the necessary 
qualification, he cannot convey his speciality to the workman 
by precept, and the best informed upon the subject will most 
readily admit how difficult it is to get a simple direction 
carried into effect by the mechanic to whom use has become 
second nature. 
We cannot recommend our readers to adopt the system 
proposed by Mr. Gamgee, because we cannot discover that he 
propounds any novel method of shoeing, unless insisting 
upon the necessity for good and intelligent workmen, with 
proper tools wherewith to properly adapt the surfaces of shoe 
and foot, can be so construed. But all who are interested in the 
art of shoeing and treatment of the feet of the horse in health 
and disease, will find much interesting matter in the work, 
which has at least the undoubted merit of being the produc¬ 
tion of a man who is practically familiar with his subject. 
Extracts from British and Foreign Journals. 
ON THE CELLULAR STRUCTURE OE THE RED BLOOD- 
CORPUSCLES. 
By Joseph G. Richardson, M.D., Microscopist to the Pennsylvania Hospital, 
Philadelphia, Pennsylvania. 
For many years after the magnificent cell theory was first 
accepted by physiologists, the doctrine of Schwann, who 
regarded the red blood disks as minute membranous sacs con¬ 
taining a coloured fluid, passed almost unquestioned; but of 
late, especially since more careful microscopic observations 
have become customary, it has been found that the supposed 
bursting of these little bladders, long looked upon as one of 
the strongest proofs of their cellular nature, does not take 
place, and at the present time some of our leading authori¬ 
ties, both in America and in Great Britain, assert positively 
that the coloured blood disks are non-vesicular, and deny 
any differentiation of their substance into cell wall and cell 
contents. 
