In 1892 Galpin was transferred to Queenstown, where he was to remain until his retirement in 1917. By now his herbarium specimens had grown to about 1500 in number. He made extensive collecting trips to mountains in the Eastern Cape, including Great Winterberg, Katberg, Stormberg and Andriesberg. In 1904 his wife accompanied him on a trip to the Basutoland border where they collected around Ben MacDhui and Satsannasberg. In 1897 he set out on a trip from Port Elizabeth to Humansdorp, Knysna, George, Riversdale, Swellendam and Caledon districts, ending in Cape Town. Here he spent some time at the Bolus Herbarium. In 1905 he visited Rhodesia with the British Association, collecting at the Victoria Falls and the Matopos.