To investigate why men offer sperm donation via the internet, a questionnaire was disseminated via 39 Dutch-language websites thought to be visited by potential sperm donors. Nine internet donors completed the survey, men who typically knew the women they were donating to. Their responses were compared with those of a control group of 35 general sperm bank donors who were recruited using flyers in Dutch sperm banks, and who were typically unaware of the identity of the eventual recipients. The findings shed light on the motives and attitudes of internet donors. Both groups of donors indicated that their primary motivation for donating was altruism (>80% of all respondents). However, internet donors had a more pronounced desire to procreate than sperm bank donors (6 out of 9, i.e. 66 vs. 22%, respectively) and more often felt that they had good genes they wished to pass on (5 out of 9, i.e. 55 vs. 31%, respectively). The main reason internet donors gave for donating via the internet was that they wanted to know the prospective parents and be kept up to date on the progress of the offspring conceived from their donations. This distinguishes them significantly from sperm bank donors. A further finding was that they were not prompted to avoid the formal donation circuit for which, by law in the Netherlands, pregnancies resulting from donations have to be registered in a central database. This study is subject to several, in some cases inevitable, limitations, but it provides an interesting starting point that future studies can seek to confirm and extend.
Lavulose. 295 Wasserstoffentwicklung, welche durch ofteres Nachgiefsen von einigen Cubikcentimetern Essigsaure immer gleich stark erhalten wurde.Eine zweite Losung von derselben Concentration wurde wahrend funf Wochen der Einwirkung von Natriumamalgam ausgesetzt. Das Zink wurde aus der ersten als Schwefelzink abgeschieden, das Filtrat nach Verjagen des Schwefelwasserstoffs wiederholt mit Alkohol eingedampft , urn die Essigsaure zu entfernen, und schliefslich die stark eingeengte Losung zur Krystallisation hingestelit. Nach drei Monaten war dieselbe zu einem braunen Syrup eingetrocknet , Krystalle aber waren darin nicht zu bemerken. Es darf dies wohl als Beweis dafur gelten, dafs nascenter Wasserstoff in saurer Losung die Lavulose nicht direct zu Mannit zu reduciren vermag, sondern dafs eine vorhergehende Zersetzung der Substanz durch das Alkali wie dies S c h e i b l e r annimmt, nothig ist. Aus ihr erhielten wir Mannit in Krystallen. Einiges uber Lavulose ; von Heinrich Winter *). Die fruheren Arbeiten $?+*) uber Lavulose, welche in den letzten Jahren im Vereinslaboratorium ausgefuhrt wurden, haben zwar vie1 zur Aufklarung der bis dahin sehr dunklen Natur derselben beigetragen , indessen blieben noch Liicken genug in unserer Kenntnifs der Substanz ubrig. Die im Folgenden beschriebenen Versuche sind zu dem Zweck ange-*) Zeitschrift des Vereins fur die Riibenzuckerindustrie des deutr schen Reiches 91, 796. **) Vgl. daselbst 1884,430 und 993; ferner 1886, 42 und 108.
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