Puzzle Answers May 2017
2 May 2017 by qmwwwtqmqt.d qmwwwtqmqt.d
ACROSS: 1 Alchemy 8 Queen bee 9 Magnesia 10 Squirt 11 Sappho 13 Trivalve 14 Photo-emission 18 At a pinch 20 Langur 21 Pay-out 22 Omnivore 24 Pleurisy 25 Symptom. DOWN: 2 Lava lamp 3 Horn 4 Maestoso 5 Jet-ski 6 Insulation 7 Heather 8 Quantum theory 12 Phosphorus 15 Salinity 16 Neutrino 17 Gas-pipe 19 Nitric 23 Vamp.
A polarised light micrograph of a section of cat skin, showing hairs, whiskers and their blood supply. This sample is from a Victorian microscope slide. Blood vessels were injected with a red dye called carmine dye (here appearing black) in order to visualise the capillaries in the tissue, a newly developed technique at the time. This image is a composite made up of 44 individual images stitched together to produce a final image 12 mm in width.
Here, fine hairs (yellow), thicker whisker (yellow) and blood vessels (black) are all visible. Whiskers, unlike normal hair, are touch receptors, each containing a sensory organ called a proprioceptor.
Credit: David Linstead
