Original prints taken on RHY's trip to Malaysia in 1899-1900. Glass plate negatives are held of some of the shots. The titles of the photographs are transcribed from RHY's labels, though some prints are unlabelled and all are undated.
Drawings for "Stratification" 1909
Drawings for Yapp "Stratification in the vegetation of a marsh." Annals of botany Vol. XXIII, no. XC. April 1909. Four of these drawings are printed in the published article, the fifth appears to have been produced at the same time, and annotations suggest that it was originally intended to be used for the same article.
Drawings for "Spiraea ulmaria" 1912
Drawings reproduced in Yapp, "Spiraea ulmaria, L., and its bearing on the problem of xeromorphy in marsh plants." Annals of botany Vol. XXVI, no.CIII, July 1912.
Drawings for "The salt marshes of the Dovey estuary"1917
Drawings reproduced in "The salt marshes of the Dovey estuary." Journal of ecology Vol. V, No.2, June, 1917. Drawings are annotated in red ink with the figure number and instructions for printing, though the numbering of the figures has changed in the published article. Not all drawings reproduced in the article are present. Glass plate negatives exist of some of the drawings.
Large scale photographic prints of six images of leaves on a black background, at least two of which were used as plates in a publication, as duplicate copies labelled 'Plate I' and 'Plate II' are present.
Ten prints of six different shots of landscape and vegetation, including a plant specimen in a laboratory. Three of the shots are labelled in green ink 'Fig.44', 'Fig.66', and 'Fig.67', presumably for reproduction in a publication. 'Fig.66' corresponds to glass plate negative F100 and 'Fig.67' to F27. The other prints do not appear to have matching negatives. All are unlabelled and undated.
Small green album with 'Photographs' in gilt on the front cover. Labelled on the inside front cover: "R.H. Yapp. CORNWALL. NEWQUAY DISTRICT. June & July 1902". Contains 29 photographic prints either 3" x 4" or smaller ovals. Most of the prints are labelled, and many correspond to glass plate negatives. The subjects include scenery, plant life, and members of RHY's family.
Photograph album containing 6 loose photographic prints 4" x 6" or larger, with 26 prints 2.75" x 3.75" inserted in the album. Many pages have empty spaces without photographs. Photographs all appear to be from RHY's Malaysian trip in 1899-1900. A few of the shots correspond to glass plate negatives, but not all. Album is completely unlabelled.
Six prints of glass plate negative G81 showing clover heads against a black background; two copies of a shot of an unidentified plant; two copies of a shot of a seashore landscape; and one of a flat landscape. None is labelled nor dated.
Unlabelled bundle of prints, mostly depicting the effect of frost on leaves. Some are duplicates. Three of the shots correspond to glass plate negatives 6, 8, 9, and 10 in the 'Frost' section.