. Nature . etes theinsulation of the rider from the frame. Upon exchangingmy grip of one of the handles for the bar, I felt the effectsof a static charge which was sufficiently startling toendanger equilibrium for the moment. I do not suggestthat the pneumatic tyre, which successfully insulates avehicle from the earth, adds a new terror to locomotion,for even a timid rider in traffic would hardly be endangered,but it would be interesting to know if this phenomenonhas been observed before, either on cycles or S. Ball, Gleneldon Road, Streatham, London, ,July 2. lO
. Nature . etes theinsulation of the rider from the frame. Upon exchangingmy grip of one of the handles for the bar, I felt the effectsof a static charge which was sufficiently startling toendanger equilibrium for the moment. I do not suggestthat the pneumatic tyre, which successfully insulates avehicle from the earth, adds a new terror to locomotion,for even a timid rider in traffic would hardly be endangered,but it would be interesting to know if this phenomenonhas been observed before, either on cycles or S. Ball, Gleneldon Road, Streatham, London, ,July 2. lO NATURE [July 7, iqio MARINE BIOLOGICAL PHOTOGRAPHY. THOUGH year by year photography plays agreater part in the illustration of works onnatural history, marine biology does not appear tohave received its full share of attention from thescientific photographer. It can be claimed for photography that it is anaccurate and rapid method of making marine biologi-cal records. The rapidity admits of the recording of. —Young Thornback delicate structures during life, thus avoiding theopacity and distortion that so soon follow death; butthe main advantage lies in the fact that by meansof photography the number of workers makingrecords can be greatly increased. Expert biologistswho have the time to make drawings of minutestructures are distinctly limited in number, whereasthe photographer with but a general biological know-ledge is able to make accurate and useful recordsof structures, possibly quite new to him, andmany points of wliich he miglit miss were heto draw them. In order to derive the full advantagesoffered by photography, the worker must beprepared, in addition to illustrating minutestructures, to deal with the habits, move-ments, characteristic postures, and generalexternal appearance of any particular marimanimal. Such records should preferably bimade in natural environments, but, failini;this, in special tanks. Prof. Reighard, in his contribution Photo-graphy of Aquat
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
