Slide showing microscopic image of 'Filaria in proboscis of mosquito'. Slide shows black and white microscopic image of 'Filaria in proboscis of mosquito'. Handwritten label in white ink below image reads, 'T.O.48. Filaria in proboscis of mosquito'. Filaria is a parasitic roundworm that lives in human beings and animals. It is chiefly found in Asia, Central Africa and the Southwest Pacific. Label above image reads, ' Newton & Co. 3 Fleet Street London'. Newton & Co were described as 'Opticians and Globe Makers to the Queen, 1861- 85', having succeeded Newton & Son (John and William Newton) from premises in Chancery Lane, London. Label is partly obscured by tape. Number '64' written on tape on top edge of slide. Late 19th - early 20th century