926 / 
As soon as a voluntary act does make use of the motor mechanism 
of the double eye which is connected indissolubly with the turning of 
the head towards the right, there will necessarily be made an 
endeavour to employ another mechanism than that existing in the 
norma. 
The prevailing innervation-tendency for turning the eyes towards 
the left is now in conflict with the impulse of turning towards the 
right. As a result of it, first the turning of both eyes towards the 
left may be observed, whilst it is only after this that the position 
of extreme turning towards the right is attained. 
As a consequence of this the fixation of the eyes on objects 
standing to the right is not synchrone with the turning of the head. 
Therefore these objects are not instantly recognized, as long as the 
settling of the eyes remains defective. 
The same case does present itself if the head is turned towards 
the left, with this difference that no turning of the double eye 
towards the left then precedes. In this latter case the voluntary and 
the reflective movements are added up together, the eyes are moving 
too quickly, with the result that objects standing on the right are 
again not instantly well-recognized, though the irregularity is redressed 
much sooner than when looking towards the right. As fourth and 
last symptom we find the static ataxy shown by the patient, a 
symptom that may depend either on an interruption of rubro-spinal 
or vestibulo-spinal tracts, or on the softening that probably exists at 
the base of the cerebellum, or on both. 
All symptoms taken together however indicate a sudden inefficacy 
of the nerve-area, irrigated by the arteria cerebelli posterior inferior. 
Chemistry. — “The metastability of the Metals in consequence 
of Allotropy and its significance for Chemistry, Physics and 
Technics. IIT?’ By Prof. Ernst ConeN and G. pr BRUIN. 
The specific Heat of the Metals 2. 
1. In the first paper on this subject *) it was pointed out that 
the existing data on the physical and mechanical constants of metals 
known up to the present are to be considered as entirely fortuitous 
values, since they refer to the indefinite metastable systems which 
are produced when metals pass from the molten to the solid state. 
In other words: all physical and mechanical constants of the metals 
are functions of the previous thermal history of the specimen expe- 
rimented with. 
1) Proc. 16, 632 (1913). 
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