VI. MEDICINE, HYGIENE, ETC.--How Cholera is Spread.

Sulphurous Acid and Sulphide of Carbon as Disinfecting
Agents.--Methods of burning the same.


VII. MISCELLANEOUS.--Improvised Toys.--With numerous illustrations.

The Æolian Harp.--Kircher's harp, made in 1558.--Frost and
Kastner's harp.--Manner of making the harps. 4 figures.

How to Break a Cord with the Hands. 1 figure.

An Aquatic Velocipede for Duck Hunting. 2 engravings.

Skeleton of a Bear Found in a Cave in Styria, Austria.


VIII. BIOGRAPHY.--Theodor Billroth, Prof, of Surgery at Vienna.--With
portrait.

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ACKNOWLEDGMENT.


The illustrations and descriptions we give this week, entitled "How to