670 
Trichina and their Distribntion. 
[November, 
suggestions to make, which if followed out would certainly 
lessen the evil. He would prohibit feeding pigs on raw offal 
of any description. “ All animal matter fed to pigs must be 
chopped into pieces not larger than a cubic inch, and tho- 
roughly cooked.” This process, he considers, would not 
only destroy the parasites, but so improve the food that the 
extra expense would be more than made up. 
This recommendation is right to a certain extent, but we 
should propose a more decisive step, viz., the total prohibi- 
tion of animal offal, blood, &c., being used for feeding swine, 
or any other beast consumed as human food. 
Secondly, Mr. Phin would forbid the use of slaughter- 
house manure or offal on pastures or “ land on which are 
grown vegetables to be eaten in a raw state by man or beast.” 
This prohibition must, by a parity of reasoning, be applied 
to sewage. The use of blood, offal, &c., might be rendered 
perfectly safe by a process of torrefaCtion at about 250°. At 
this temperature no valuable principle is driven off, and, ac- 
cording to the experience of certain French authorities, 
animal matter thus treated is more available as plant-food, 
whilst all Entozoa would certainly be destroyed. The 
slaughter-house refuse at present given to swine would find 
a useful application as manure after being submitted to this 
process. 
Sewage-irrigation would of course be very much restricted 
in its applications, but manures obtained by precipitation 
would be freed from Trichina and other Entozoa by the tem- 
perature employed in drying the deposit. 
Mr. Phin’s pamphlet may be regarded as exceedingly 
timely in giving, in a condensed and intelligible form, correct 
information on a newly-recognised danger. 
