Enter any of roughly 1500 keywords and find out how many times Husserl used this term in each of 23 Husserliana volumes (this represents 67% of his published works). Sort results by date, volume number, book title, and number of occurrences. In this way you can easily see in what text, from what period of his life, he used this term and with what frequency. This in turns allows the user to track the "density" of certain words over the course of Husserl's long career. Inhalt (content), for example, appears more early on, while horizon occurs more later on, consistent with what is known about Husserl’s evolving thought. Search results are currently linked to discussion forums for books and will soon be linked to discussion forums for relevant concept and periods of Husserl’s career.


Between 1996 and 1998 a team of philosophers in Japan scanned 23 of the then-available Husserliana volumes, with the goal of making his vast corpus accessible and navigable on-line. While copyright restrictions prevented this, they were able to make the results of keyword searches available. However, the format in which these results were published makes them difficult to navigate. With the permission of the project director, I downloaded the entire Japanese site and created an internet-accessible and searchable database of their keyword search results.

This search engine is a supplement to the Husserl database, not a replacement. This page shows you how often a given key word shows up in Husserl, in what text, and in what year that text was written. It does not show you exactly where each keyword is in Husserl's texts. For that you have to go directly to the Japanese database (see below for directions).

In 2013, several errors in the way the search results were presented here were corrected.  For example, what were listed as "supplementary texts" were actually footnotes.  All the primary search data were revalidated as well.


The basic search is easy. Enter a key word and press submit or simply press "enter" on your keyboard. "%" is a wildcard. "%heit", for example, yield "einheit." You do not need to add wildcards at the end of words. This is automatic. "horiz" is thus the same as "horiz%"

No booleans are allowed. You cannot search for "horizon AND region"

Note that the search results are partial--not all Husserliana volumes have been processed by the Japanese team. To find what keywords are available and which volumes were searched in compiling results for that word, see the list of key words.

Interpreting the Results

The result of a search is a list of words, the book they occur in, and their frequency in that text (editor's introduction, footnotes, and main text are distinguished). A "*" symbol means that that wildcard was used by the Japanese team when they conducted the original search of Husserl's actual texts.

Finding Page References in the Original Texts

Unfortunately, this process is convoluted, though I am working on streamlines. To find the references, you will have to (1) note the volume number for the text you are interested in, (2) go to the Husserl database, (3) click on the Husserliana volume number, (4) click on letter.dat file where "letter" corresponds to the first letter of the word you are looking for, and (5) search that page for the word you are looking for. You should get results that tell you on what page(s) in that Husserliana that keyword appears.

So, for example, if you do a search on "akt", and want to find out where akt* shows up in Studies in Arithmetic and Geometry, you will first correlate Studies in Arithetmic and Geometry with Husserliana 21, then click to the Husserl database, then click on 21, then click on a.dat (which contains all references starting with the letter "a"), then scroll down to "akt*."

For cases where a word occurs between 1 and 10 times the results are in a file called "minder.dat"