Jubilee issue Petronella hospital: Pruys initiated auxiliary hospitals in the south of central Java. He established together with the Sultanate and the sugar industry these auxiliary hospitals. In 1914 a subsidy was accorded to the small auxiliary hospital of Wonosari (Surakarta). The subsidy was granted on the base of a small auxiliary hospital of 26-75 beds and amounted to f 5810,52 for establishment expenditure and of f 2250 for initial equipment. (KV 1915 addendum XI). In 1917  an amount of 2495,53 was granted, f 480 of this amount was specified for European nurses (KV 1918, bijlage Q).

Nowadays the hospital in Wonosari is called: Rumah Sakit Umum Daerah Wonosari and is established on Jalan Taman Bhakti no. 6. Its website is: http://www.rsudwonosari.gunungkidulkab.go.id.