Microscope in the brewery and malt-house / by Chas. Geo. Matthews and Francis Edw. Lott.

  • Matthews, Chas. Geo. (Charles George)
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: Microscope in the brewery and malt-house / by Chas. Geo. Matthews and Francis Edw. Lott. Source: Wellcome Collection.

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    phenomenon by mixing a little gamboge with water and examining it under the microscope ; minute particles and globules exhibiting much activity will be seen. This is known as the Brownian movement. Another point worthy of consideration is, that there is occasionally a possibility of mistaking globules of hop resin for small forms of Saccharomyces and other organisms. Where there is a doubt, it may be dispersed by treating some of the Beer sediment with a little weak Ammonia or other slightly alkaline liquid, when the resin dissolves ; generally clearing the field to such an extent that a further examination indicates very precisely what organisms or forms are really present. Plate VI., Fig. 2, represents a sediment resulting from a beer brewed with very impure yeast, in respect to wild forms : some of the ordinary extraneous matters are also given. In the case of isolated cells, it is by no means easy to refer them to their precise species of Saccharomycetes, though sometimes there is little doubt as to what they are. In the present case [Plate VI., Fig. 2] S. Pastorianus and Caseous Yeast No. 2, may be recognized, but the usual uncertainty attends the other forms.
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