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bacteria
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Devils Bridge sketched by Lister
'Devils Bridge' sketched by Lister on his travels through Europe showing a bridge crossing the Gotthard Pass, northern approach, Switzerland. The term 'devil's bridge' is applied to many ancient bridges found primarily in Europe. These were stone or masonry arch bridges and, because they represented a significant technological achievement in ancient architecture, were objects of fascination and stories. The most popular of these featured the Devil, either as the builder of the bridge (relating to the precariousness or impossibility of such a bridge to last or exist in the first place) or as a pact-maker (sharing the necessary knowledge to build the bridge, usually in exchange for the communities souls). The legend attached to the bridge sketched by Lister is of the latter, and was related by Johann Jakob Scheuchzer in 1716. According to Scheuchzer, the people of Uri recruited the Devil for the difficult task of building the bridge. In return for his expertise, the Devil requested the soul of the first thing to pass the bridge. To trick the Devil, the people of Uri sent across a dog by throwing a piece of bread, and the dog was promptly torn to pieces by the Devil. Reference: Scheuchzer, J. , 1747 [1716]. Naturgeschichte des Schweitzerlandes. Vol. 2: 94. -
Tobacco Mosaic Virus
During the late 19th century, tobacco farmers observed a strange occurrence on the leaves of their tobacco plants. A mosaic pattern of light and dark green (or yellow and green, in some instances) appeared on the leaves of their crops, the presence of which signalled the steady decline in the plant’s growth. Because of the lucrative nature of the industry, finding a treatment for this seemingly infectious disease became a priority, with many laboratories working to isolate the cause. Bacteria were recognised as the causative agents of many infectious diseases of plants and animals, including humans, in the second half of the 19th century – and the technique of filtration was developed to separate infectious agents from extracts or exudates in order to study these microbes. It was whilst utilising this technique that Dmitri Ivanovski, a Russian microbiologist working in the Crimea in 1890, made a surprising discovery. Using the Chamberland–filter made from porcelain and designed to trap ordinary bacteria, Ivanovsky discovered that the filtered sap from the diseased plants could continue to transfer the infection to healthy plants – an occurrence he attributed to an agent which must be an exceedingly small parasitic microorganism, invisible even under great magnification. It would take another 45 years before the visualisation of this subcellular entity would be formulated with the help of an electron microscope, but Ivanovksy, along with the Dutch botanist M.W. Beijerinck, who also and independently, isolated these microbes in his laboratory in 1898, are generally credited for the discovery of viruses. The disease which infected the tobacco plants would be aptly called the Tobacco Mosaic Virus, and its identification would signal the initiation of a field of study known as virology. -
Iodoform
"Since the beginning of the 20th century, iodoform has been commonly used as a healing and antiseptic dressing or powder for wounds and sores, however such clinical use to this date is limited. Iodoform is soluble in fatty acids and decomposes releasing iodine in nascent state (96,7% of iodine) when in contact with secretions or endodontic infections" (Estrela 2006: 33 - 37). -
Corrosive Sublimate
"Powerful antiseptic. Highly poisonous. Use with caution. Gr. 1.75 in four ounces, or gr. 8.75 in a pint of water, makes a solution of 1 in 1000, a useful strength for washing wounds, etc (BWC 1925:125).
