Patents* 
431 
by the currier is sold to the glue maker : the offal of the 
leather during the process or after tanning, is laid by and 
sold to the makers of snuff-boxes, &c. 
The dead horse, is a subject for dissection to young 
students in comparative anatomy, who pay for the licence 
of go-ing to the repository, a guinea a quarter. The flesh 
is then cut off, boiled, and sold to people who hawk it 
about the streets of London in wheelbarrows, as cat^s 
meat and dog’s meat, at 1 \‘2d, per lb. 
The hoofs, are sold to the makers of Prussian blue. 
The bones, are sold to two descriptions of manufacturers : 
1st, to the makers of cart-grease, who reside at the out- 
skirts of London, and boil the bones for the sake of the fat 
and marrow ; which, wlien cold, is skimmed off, and mix- 
ed with an equal quantity of tar to make the composition 
necessary to grease carriage wheels. Or, 2dly, they are 
sold to the manufacturers of volatile alkali, who make 
spirit of hartshorn, and sal ammoniac out of them, by dis- 
tilling in large iron cylinders. The bones thus boiled 
down, used in my time, to be sent back again to a steam 
mill near St. John’s, Cierkenwell, where they were ground 
into a coarse powder, and sold as a top dressing for grain 
crops. T. C. 
ON PATENTS.—BY THE EDITOR, 
THIS subject is now becoming very important, and is inti- 
mately connected with the whole range of domestic manufacture. 
The number and nature of the patents granted under the laws of 
the United States, have hitherto contributed little to the improve- 
ment of manufactures, but threaten much to the increase of law- 
suits and impositions. I propose to offer a few remarks on this, 
topic : and as we are not likely to throw aside the lights we may 
acquire from British precedents, and British practices, I shall 
give a summary of tlie decisions of that country on tins set of ques= 
tions^ 
