FACTS AND OBSERVATIONS. 103 
in a liquid form, and as soon as the preliminaries are 
adjusted, the public will obtain the benefit/"’ 
iiRtiFiciAL ^ Siamese Twins.^ —A curious and interest¬ 
ing experiment was lately made at Strasburg to effect the 
union of two animals, so that they might, to a certain degree, 
have a life in common. It was, indeed, producing artificially 
what nature produced spontaneously in that extraordinary 
phenomenon, the Siamese twins. Two white rats, of the 
Albino species, were selected for the experiment, probably as 
being more manageable than their darker brethren. An 
incision was made on the right side of the one, and on the 
left of the other, involving the skin and the cellular tissue 
under it. The surfaces of the two wounds were kept closely to¬ 
gether by sutures and bandages until the sixth day, when union 
by the first intention was found to have taken place. They 
then walked side by side, being united by a fleshy bank. An 
attempt subsequently made to poison both by the mouth of 
the one did not succeed, but an injection thrown into the 
jugular vein of one animal was found to have entered the 
superficial femoral veins of the other, showing clearly that an 
intimate vascular union had already taken place between 
them. This interesting experiment may have a most im¬ 
portant bearing on restorative surgery. 
De Candolle on Species. —In an article on the Cnpu- 
li/ercB in the ^ Bihliotheque TJniverseli M. Alphonse de Candolle 
observes, hereditariness is an attribute of races as well as of 
species. To cite an evident example, the Jewish people have 
a certain hereditary configuration, which they preserve under 
all climates and influences of nutrition, without any one pre¬ 
tending that they constitute a species. Non-hereditariness 
may overthrow a pretended species, but hereditariness, even 
when it appears to be indefinite, does not prove the existence 
of a species.^’ 
Ozone produced by Plants’ —M. C. Kosman has 
communicated to the French Academy a series of observa¬ 
tions, from which he draws the following conclusions:—1. 
Plants evolve ozonised oxygen from their leaves and green 
parts. 2. They disengage during the day ozonized oxygen 
in a greater ponderable quantity than exists in the circum¬ 
ambient air. 3. During the night the difference between the 
ozone produced in the plants, and that contained in the air, 
becomes 7iil in the case of isolated vegetation, but where the 
plants grow thickly and vigorously, this ozone is more abun- 
