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Facts and Observations, 
RESEARCHES ON THE DEVELOPMENT AND PROPAGATION 
OP TRICHOCEPHALUS DISPA R, AND THE ASCARIS 
LUMBRICOIDES. 
By Dr. Davain. 
The conclusions to which these researches lead are: 
1. That the ovum of the trichocephalus, and of ascaris, may 
be developed out of .the body of man. 
2. That the appearance of the embryo, in both cases, occurs 
in six or eight months in winter, and in one month, or even 
less, in summer. 
3. That the embryo, shut up in its ovum, may live there 
for more than a year. In this long interval of time, the ova 
of trichocephalus and of ascaris lumbricoides can, no doubt, 
be transported by rivulets into rivers—rivers and wells, the 
water of which is used as drink or in the preparation of food. 
These ova, completely developed, can thus be conveyed into 
the intestine of man, where they attain to adult development.— 
Journal cle Physiologie. 
NITRATE OP SILVER IN ASCARIDES. 
Dr. Schultz states that he has employed enemata of this 
substance with great success for the removal of the oxyuris 
vermicularis which so frequently infests the rectum in such 
large numbers. The clyster is formed of argent, nitrat. gr. x. ad 
xv. to aq. dest. oiv. Two, or at most three, of these suffice 
to effect a complete cure. The first one does not usually 
remain up long, and worms, some living and others dead, are 
returned with it. The next clvster remains from six to twenty- 
four hours, and the great mass of the dead worms are dis¬ 
charged with it .—Deutsche Klinik. 
ORIGIN OP THE ACARUS SCABIEI. 
M. Devergie has asserted that the acarus is not always 
the cause of itch, but sometimes its consequence; there is 
nothing, he says, which disproves the possibility that the 
produets of secretion, the atmosphere around those affected 
with itch, their clothes, &c., may give rise to the animal. 
This assertion has been refuted by M. Piogey, as the results 
