638 Report on the " Worldng Dairy " at the Derby Show. 
— and this programme was carried out as nearly as was possible. 
In some cases the visits of illustrious personages, or other cir- 
cumstances, necessitated a slight deviation from the official 
arrangements, but, upon the whole, the plan was adhered to with 
sufficient exactness. It must be confessed that the interesting 
lectures delivered by Dr. Voelcker on each day were much 
marred by the noise of the machinery, which, unfortunately, on 
two days was kept at work ; but this was the only drawback I 
discovered to this interesting exhibition. It would certainly 
be well in the future, when lectures are given by a man so well 
qualified as the learned Doctor to enlighten an audience, that 
arrangements should be made for the cessation of all work at 
the period of their delivery. 
Cream-Separating Machinery. 
The separators used in this section were — 
(1) The Laval (Swedish). 
(2) The Lefeldt (German). 
(3) The Neilson Petersen (Danish). 
It was by a fluke that the latter most interesting machine 
found its way to the Show, where it formed the only specimen 
of its kind in England, though several are at work in Denmark. 
In Mr. Jenkins's recent travels in the latter country on the 
business of the Duke of Richmond's Commission, he found the 
machine in question, and, being impressed with its apparent 
value, he hastened to acquaint Mr. AUender of its existence. 
The latter gentleman, by prompt action and the use of the 
telegraph, succeeded in procuring the specimen in question for 
the Derby Show : but it was not until the last moment that 
it was known that it would be possible to include it in the 
exhibits of which it formed so interesting a feature. 
The Laval Separator is pretty widely known since its exhi- 
bition at Kilburn in 1879. It obtained a silver medal at that 
Show, and many other prizes have at various times been 
awarded to it. The following description by Mr. Coleman and 
Mr. Courtney, which appeared in the ' Journal ' of the Society 
(vol. XV. part ii. p. 704), together with the illustration which 
accompanied it, may, perhaps, suitably find a place here, since 
they give, in words better than I could find, an account of the 
operation of the machine : — ■ 
"Separation in all cases is the result of gravitation. The 
cream-globules, being of less density than the watery parts, rise 
to the surface. The action of the machine is to expedite the 
process, by submitting the milk to rapid centrifugal motion, 
which causes the heavier ingredients to be thrown to the outside 
