82 THE NORTHERN MICROSCOPIST. 
paper and it is then ready for the engraver. The illustration 
shown in fig. 8 has been prepared by the above process, from the 
same picture as the Woodbury type at Plate V; and also the 
figs. 1 and 2 in No. 1 of THE NorTHERN Microscopist, which 
were first photographed from the microscope by the aid of the 
quarter-inch objective. 
TRIGHINA SPIRALES: 
T the present time there appears to be considerable excitement 
caused by the prevalence of trichinosis amongst the swine, 
which are brought from the surrounding country into Chicago as a 
centre, where they are killed and cured; and as pork, hams and bacon 
are despatched to all quarters of the globe. The matter has been 
deemed of so much importance that relative questions have been 
asked in the House of Commons as to whether the Government 
intend taking steps to prevent the importation of infected pork 
from America. 
Mr. Mundella finds that we receive into this country every year 
from America no less than 514 million cwts. of pork representing 
a money value of 914 million pounds sterling, and therefore the 
prohibition of such a vast food supply could only be justified by 
the most urgent necessity. 
In France, Russia, Italy, Austria, Spain, Portugal and Greece 
the importation of American pork has been prohibited, but in these 
countries the inhabitants do not rely so much upon imported meats 
as those of the British Isles. ‘ 
The Manchester Courier in an article upon the subject, a short 
time since pointed out that a case of urgent necessity had not then 
arisen, in which for want of better information we must concur 
though we cannot agree to the statement “that no case of 
trichinosis has occurred in this country,” since we possess a slide 
labelled ‘ Trichinze cysts in human muscle, from Chorlton work- 
house, 1872.” 
In France trichinosis has always been rare and exceptional, and 
in Germany, according to the latest statistics, it has been notably 
reduced since the introduction of compulsory microscopical 
examination. Of the 1,728,595 swine examined 800 animals were 
found infected, while at Lienképing in Sweden one in 63, at 
Copenhagen one in 465, and at Schwerin one in 550 were diseased. 
At Chicago, it is stated that out of 400 pigs examined 28 were 
infected, and Nocart and Bonley found 20 hams infested with this — 
parasite out of 200 which had been imported into Sweden from 
America, 
