274 Transactions British Mycological Soctety. 
more than a yard to traverse, M. Parenteau picked up the bean 
and put it in his pocket. The Arion stopped, raised its head, 
and turned in every direction, waving its tentacles, but without 
advancing. M. Parenteau then carried the bean to the other 
side of the road, and put it in a small hole behind a piece of 
stone. The Arion, after a moment’s indecision, started off 
straight for the bean. Again the position of the precious morsel 
was changed, and again the Arion made for it, this time without 
being further tantalised. 
M. Moquin-Tandon noticed, one rainy day in the botanical 
gardens at Toulouse, two Limax maximus approaching a rotten 
apple from different directions. He changed the position of the 
apple several times, placing it at a sufficient distance to be sure 
they could not see it, but they always hit it off correctly, after 
raising their heads and moving their long tentacles in every 
direction. It then occurred to him to hold the apple in the air, 
some centimetres above the head of the Limax. They per- 
ceived where it was, raised their heads and lengthened their 
necks, endeavouring to find some solid body on which to climb 
to their food.” 
As confirming M. Moquin-Tandon’s experiment, and as further 
evidence that the olfactory sense in Limaces is extremely acute, 
J. W. Taylor in his Monograph relates the following*: 
“Mr L. E. Adams, about ten o’clock, one dark, windy, and 
wet evening in August, 1897, at Clifton, Derbyshire, saw a 
Limax maximus crawling directly toward a plate upon the lawn, 
containing the remains of the dog’s dinner; when first observed 
the slug was about six feet distant from the plate, but within 
thirty minutes had reached it; the plate was then removed to 
a second position, about six feet away, but in another direction ; 
the slug almost immediately changed its course, and again made 
straight towards the plate, on again nearing it the same process 
was repeated with the same result, the plate being finally re- 
moved and placed in a fourth position, eight feet away, and 
directly to the leeward of the slug, yet in a little more than 
half-an-hour the slug had reached the plate.” 
Ernst Stahlt of Jena, whilst carrying out some extended 
investigations upon the chemical and physical means by which 
certain plants are protected from the attacks of slugs and snails, 
incidentally convinced himself by experiment that slugs find 
their way to their food by their sense of smell. He placed a 
* John W. Taylor, Monograph of the Land and Freshwater Mollusca of the 
British Isles (Testacellidae, Limacidae, Arionidae), Leeds, 1907, p. 37. 
+ Ernst Stahl, Pflanzen und Schnecken, Eine biologische Studie iiber die 
Schutzmittel der Pflanzen gegen Schneckenfrass, Jena, 1888, pp. 15-16, foot- 
note. 
