Genre: Scientific Photography Cyanotype negative photogram listing algae specimens included in volume III, on paper watermarked 'J Whatman Turkey Mill 1851,' and with British Museum yellow datestamp for 12 Nov 1853 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 12 Nov 1853 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimens, on paper watermarked, 'J Whatman Turkey Mill 1851,' and with British Museum yellow datestamp for 12 Nov 1853 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 12 Nov 1853 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 12 Nov 1853 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of two algae specimens, on unwatermarked paper, but with British Museum yellow datestamp for 12 Nov 1853 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 12 Nov 1853 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of three algae specimens, on unwatermarked paper, but with British Museum yellow datestamp for 12 Nov 1853 on reverse.