Gosh you were busy Gaynor, yet another two generations. I had to search who was who

I’m afraid that they are not online, familysearch did microfilmed them
https://familysearch.org/search/catalog/295926?availability=Family%20History%20Librarythe ‘missing years’ are available on microfilm in the State Archives at Kortrijk and Bruges and in the city archives of Veurne. The State Archives are digitising the parish records from the original registers, which are the parish cert images on the State Archives, unlike the civil records which are digitized microfilms, the same as on familysearch (or something like that). The only reasons I could think of is that they are not digitized yet or the original parish books are not available anymore or in too poor condition.
BLZ = bladzijde = page, page number 659 of the register (which is not online)
will see what I can find in the afternoon, in the meantime : links to various parish index transcriptions for Brussels
on the portal site
http://www.geneaknowhow.net/index.htmlclick on ‘digital resources Netherlands and Belgium’
click under Brussel-Bruxelles on ‘internet’ (left hand column)
link (one of) on the website of the city Brussels index baptism 1752-1792 (for all parishes of Brussels)
http://www.brussel.be/artdet.cfm/7654/Collectie-parochieregisters click on the link ‘Entraide généalogique’
transcription of the census Brussels 1812
http://bruxelles1812.org/ (searchable name indexed pdf)
original census Brussels 1795 and 1799
http://www.pallas.be/pls/opac/plsp.getplsdoc?lan=N&htdoc=general/opac_avb.htmor french version
http://www.pallas.be/pls/opac/plsp.getplsdoc?lan=F&htdoc=general/opac_avb.htmtype in the search box : volkstelling and click on zoeken or rechercher and click on the 1795 or 1799 link
The census is divided in 8 sections . Section 1 and section 5 of the 1795 census is not available. The links which giving access to the online census are those with ‘Raadpleegbaar op Internet’ or ‘Consultable sur Internet’. (Simon Gallemaert lived in rue Terre-Neuve, section 2 in 1799)
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