826 DOCHMIUS DUODENALIS AND ANGUlLLUL^B. 
Mature larvce encapsuled and discysted put in good 
Marsala, received through the kindness of my friend Prof. 
Bizzozero, became soon very lively ; twenty minutes after 
the movements grew slower, forty-five minutes after they 
became very weak, and were only discerned now and then. 
After an hour and forty minutes they were, however, still 
alive. It is to be noted the experiment was made as fol¬ 
lows :—On a glass slide was put a drop of water containing 
the larvae, to which were repeatedly added drops of Marsala. 
Many larvae, however, in the first day of capsulation, treated 
with plenty of Marsala in a watch glass, began to die after 
twenty-five minutes, and were found all dead after an hour 
and twenty minutes. In santonate of soda and in the 
infused saturo of corallina, they were seen to live beyond 
six hours, without having shown suffering or alteration. 
A drop of water containing larvee of mature Anchilostoma, 
exposed, in a damp room, to the action of the vapours of 
essence of turpentine, after six hours the larvae were still 
very lively. 
In the infusion of kamala the larvae, even in their first 
stadium, were still alive after twenty hours. 
In the infusion of kousso, cold and hot, they were very 
lively for more than an hour. In a strong taenicide of Drs. 
Haidlen and Haek, of Stoccarda, mature larvae lived over 
forty minutes. In the ethereal extract of male fern, old and 
well prepared, they died very quickly; in less than five to 
ten minutes their motion ceased completely and their life. 
The knowledge of the history of the development of the 
helminths, cause of the disease at San Gottardo, and the 
results of the numerous experiments made on the larvae by 
means of heat, chemical reagents, and different pharmaceu¬ 
tical substances, now suggest to us the means adopted to 
prevent the disease with certainty, either with labourers or 
other individuals that may henceforth be employed in exca¬ 
vations analogous to that of the Cenisio, S. Gottardo, &c.; 
and what is the most important in the present state of 
things to cure so many poor creatures, incompetent to work, 
and hurtful to themselves and their families. 
When the perforation of another mountain is to be under¬ 
taken, Mont Blanc, for instance, or a similar work, the first 
thing to be done should be to examine (medically) all the 
labourers before their being accepted, so as to exclude 
entirely (or to keep them under given conditions) all those 
proved to be infected, though but slightly, by Anchilostoma 
or Anguillulce. By a vigorous execution of this rule the 
importation of the germs will be obviated, or, better even, 
