Interim kEroRT oft veterinary investigations. 347 
immature condition they should become parasitic to some of 
the grasses, natural and artificial, on which the lambs are 
fed at the time of being attacked. With a view to assist in 
this part of the inquiry, I have asked for and received 
portions of turf cut from meadows on which diseased lambs 
had been pastured. These turf-cuttings have been supplied 
by two members of the Lincolnshire Committee, and will, as 
soon as the season is more advanced, be subjected to a 
searching microscopical examination. 
With the same object in view, a series of questions—see 
Addendum—has been drawn up and forwarded to the Secre¬ 
tary of the Lincolnshire Society for circulation »among the 
members. In due time they will be answered and returned 
to me for analvsis and deduction. 
V 
It may further be remarked that, as negative evidence may 
not unlikely prove of great value in the inquiry, I have re¬ 
peated an experiment—some years since ad pted by me— 
namely, that of conveying the ova of the worm, and also em- 
bryotic worms obtained from the lungs, directly into the air 
passages of a lamb. 
On former occasions, experiments of the kind have invari¬ 
ably had a negative result; and the present one does not 
promise any other, as the lamb—the subject of the experi¬ 
ment—appears to continue in perfect health. The intro¬ 
duction of the ova and young worms has been twice had 
recourse to: first, on October 24th; and secondly, on 
November 17th, 1871. An inquiry of this kind must neces¬ 
sarily occupy much time and attention, and probably the car¬ 
rying out of numerous experiments on selected farms, as well 
as within an institution like the Royal Veterinary College. 
The subject, however, will receive every attention, and no 
time will be lost in its further investigation. 
February 1st, 1872. 
* 
XLV, 
23 
